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Document and Entity Information - shares	6 Months Ended
Document and Entity Information - shares	Jun. 27, 2015	Jul. 15, 2015
Document and Entity Information [Abstract]
Entity Registrant Name	CHARLES RIVER LABORATORIES INTERNATIONAL INC
Entity Central Index Key	0001100682
Current Fiscal Year End Date	--12-26
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Document Period End Date	Jun. 27, 2015
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	Q2
Amendment Flag	false
Entity Common Stock, Shares Outstanding		46,779,186

CONDENSED CONSOLIDATED STATEMENTS OF INCOME (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 27, 2015	Jun. 28, 2014	Jun. 27, 2015	Jun. 28, 2014
Income Statement [Abstract]
Service revenue	$ 214,380	$ 211,003	$ 411,160	$ 383,348
Product revenue	125,193	130,176	248,827	257,199
Total revenue	339,573	341,179	659,987	640,547
Costs and expenses:
Cost of services provided	144,143	147,954	280,449	271,923
Cost of products sold	62,647	67,591	127,095	134,177
Selling, general and administrative	71,331	67,756	142,728	132,523
Amortization of intangible assets	5,717	6,853	10,975	11,193
Operating income	55,735	51,025	98,740	90,731
Other income (expense):
Interest income	297	222	581	427
Interest expense	(4,376)	(3,373)	(7,400)	(6,174)
Other income (expense), net	8,672	2,667	359	8,543
Income from continuing operations, before income taxes	60,328	50,541	92,280	93,527
Provision for income taxes	11,076	14,081	11,407	24,439
Income from continuing operations, net of income taxes	49,252	36,460	80,873	69,088
Loss from discontinued operations, net of income taxes	(7)	(644)	(14)	(914)
Net income	49,245	35,816	80,859	68,174
Less: Net income attributable to noncontrolling interests	(736)	(552)	(809)	(678)
Net income attributable to common shareholders	$ 48,509	$ 35,264	$ 80,050	$ 67,496
Basic:
Continuing operations attributable to common shareholders (in dollars per share)	$ 1.04	$ 0.76	$ 1.71	$ 1.46
Discontinued operations (in dollars per share)	0.00	(0.01)	0.00	(0.02)
Net income attributable to common shareholders (in dollars per share)	1.04	0.75	1.71	1.44
Diluted:
Continuing operations attributable to common shareholders (in dollars per share)	1.02	0.75	1.68	1.43
Discontinued operations (in dollars per share)	0.00	(0.01)	0.00	(0.02)
Net income attributable to common shareholders (in dollars per share)	$ 1.02	$ 0.74	$ 1.68	$ 1.41

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 27, 2015	Jun. 28, 2014	Jun. 27, 2015	Jun. 28, 2014
Statement of Comprehensive Income [Abstract]
Net income	$ 49,245	$ 35,816	$ 80,859	$ 68,174
Foreign currency translation adjustment and other	17,953	12,902	(14,716)	7,884
Cumulative translation adjustment related to intercompany loan forgiveness	0	0	(2,341)	0
Pension and other post-retirement benefit plans:
Amortization of net loss and prior service benefit included in net periodic pension cost	761	291	1,490	580
Comprehensive income, before income taxes	67,959	49,009	65,292	76,638
Income tax expense related to items of other comprehensive income (Note 10)	263	129	480	148
Comprehensive income, net of income taxes	67,696	48,880	64,812	76,490
Less: Comprehensive income related to noncontrolling interests	805	489	878	140
Comprehensive income attributable to common shareholders	$ 66,891	$ 48,391	$ 63,934	$ 76,350

CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) - USD ($) $ in Thousands	Jun. 27, 2015	Dec. 27, 2014
Current assets:
Cash and cash equivalents	$ 150,807	$ 160,023
Trade receivables, net	277,398	257,991
Inventories	90,037	89,043
Prepaid assets	36,952	26,900
Other current assets	74,453	72,941
Total current assets	629,647	606,898
Property, plant and equipment, net	680,565	676,797
Goodwill	317,414	321,077
Other intangible assets, net	172,376	178,875
Deferred tax asset	22,699	23,193
Other assets	63,216	72,951
Total assets	1,885,917	1,879,791
Current liabilities:
Current portion of long-term debt and capital leases	17,993	31,904
Accounts payable	32,967	33,815
Accrued compensation	57,400	71,569
Deferred revenue	77,382	78,124
Accrued liabilities	76,030	67,380
Other current liabilities	12,564	11,079
Current liabilities of discontinued operations	2,196	2,299
Total current liabilities	276,532	296,170
Long-term debt, net and capital leases	754,777	740,557
Other long-term liabilities	111,256	130,361
Long-term liabilities of discontinued operations	7,547	8,357
Total liabilities	1,150,112	1,175,445
Commitments and contingencies
Redeemable noncontrolling interest	29,976	28,419
Equity:
Preferred stock, $0.01 par value; 20,000 shares authorized; no shares issued and outstanding	0	0
Common stock, $0.01 par value; 120,000 shares authorized; 85,373 shares issued and 46,850 shares outstanding at June 27, 2015 and 84,503 shares issued and 47,327 shares outstanding at December 27, 2014	853	845
Additional paid-in capital	2,372,685	2,307,640
Accumulated deficit	(58,725)	(138,775)
Treasury stock, at cost, 38,523 shares and 37,176 shares at June 27, 2015 and December 27, 2014, respectively	(1,522,747)	(1,423,260)
Accumulated other comprehensive loss	(90,363)	(74,247)
Total equity attributable to common shareholders	701,703	672,203
Noncontrolling interests	4,126	3,724
Total equity and redeemable noncontrolling interest	735,805	704,346
Total liabilities, equity and redeemable noncontrolling interest	$ 1,885,917	$ 1,879,791

CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) (Parenthetical) - $ / shares	Jun. 27, 2015	Dec. 27, 2014
Statement of Financial Position [Abstract]
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	20,000,000	20,000,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	120,000,000	120,000,000
Common stock, shares issued (in shares)	85,373,000	84,503,000
Common stock, shares outstanding (in shares)	46,850,000	47,327,000
Treasury stock (in shares)	38,523,000	37,176,000

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands	6 Months Ended
	Jun. 27, 2015	Jun. 28, 2014
Cash flows relating to operating activities
Net income	$ 80,859	$ 68,174
Less: Loss from discontinued operations	(14)	(914)
Income from continuing operations	80,873	69,088
Adjustments to reconcile net income from continuing operations to net cash provided by operating activities:
Depreciation and amortization	45,516	44,352
Amortization of debt issuance costs	1,572	868
Stock-based compensation	19,873	14,881
Deferred income taxes	934	6,643
Gain on investments in limited partnerships	(364)	(8,180)
Gain on bargain purchase	(9,878)	0
Other, net	(198)	517
Changes in assets and liabilities:
Trade receivables, net	(24,574)	(31,161)
Inventories	(1,662)	(2,502)
Other assets	5,871	(14,928)
Accounts payable	1,752	4,404
Accrued compensation	(12,757)	(1,229)
Deferred revenue	422	1,942
Accrued liabilities	8,795	10,012
Taxes payable and prepaid taxes	(6,696)	(6,802)
Other liabilities	(11,873)	(2,467)
Net cash provided by operating activities	97,606	85,438
Cash flows relating to investing activities
Acquisition of businesses and assets, net of cash acquired	(10,680)	(183,151)
Capital expenditures	(24,556)	(20,505)
Purchases of investments	(15,174)	(9,734)
Proceeds from sale of investments and distributions from investments in limited partnerships	11,356	12,818
Other, net	2,566	(1,926)
Net cash used in investing activities	(36,488)	(202,498)
Cash flows relating to financing activities
Proceeds from long-term debt and revolving credit agreement	294,213	237,920
Proceeds from exercises of stock options	35,641	36,534
Payments on long-term debt, capital lease obligations and revolving credit agreement	(301,283)	(98,404)
Purchase of treasury stock	(99,486)	(101,609)
Other, net	7,188	3,771
Net cash provided by (used in) financing activities	(63,727)	78,212
Discontinued operations
Net cash used in operating activities from discontinued operations	(927)	(689)
Effect of exchange rate changes on cash and cash equivalents	(5,680)	622
Net change in cash and cash equivalents	(9,216)	(38,915)
Cash and cash equivalents, beginning of period	160,023	155,927
Cash and cash equivalents, end of period	$ 150,807	$ 117,012

Basis of Presentation	6 Months Ended
Basis of Presentation	Jun. 27, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
BASIS OF PRESENTATION	BASIS OF PRESENTATION The accompanying condensed consolidated financial statements are unaudited and have been prepared by Charles River Laboratories International, Inc. (the Company) in accordance with accounting principles generally accepted in the United States (U.S. GAAP) and pursuant to Rule 10-01 of Regulation S-X. The year-end condensed consolidated balance sheet data was derived from the Company’s audited financial statements, but does not include all disclosures required by U.S. GAAP. These interim condensed consolidated financial statements should be read in conjunction with the Company’s Annual Report on Form 10-K for the year ended December 27, 2014. The condensed consolidated financial statements, in the opinion of management, reflect all normal and recurring adjustments necessary for a fair statement of our financial position and results of operations. Certain reclassifications have been made to prior year amounts to conform to the current year presentation. The Company’s fiscal year is the twelve-month period ending the last Saturday in December. Use of Estimates The preparation of condensed consolidated financial statements in accordance with U.S. GAAP requires that the Company make estimates and judgments that may affect the reported amounts of assets, liabilities, revenues, expenses, and related disclosure of contingent assets and liabilities. On an on-going basis, the Company evaluates its estimates, judgments and methodologies. The Company bases its estimates on historical experience and on various other assumptions that are believed to be reasonable, the results of which form the basis for making judgments about the carrying values of assets and liabilities. Actual results may differ from these estimates under different assumptions or conditions. Changes in estimates are reflected in reported results in the period in which they become known. Consolidation The Company’s consolidated financial statements reflect its financial statements and those of its subsidiaries in which the Company holds a controlling financial interest. For consolidated entities in which the Company owns or is exposed to less than 100% of the economics, the Company records net income (loss) attributable to noncontrolling interests in its consolidated statements of income equal to the percentage of the economic or ownership interest retained in such entities by the respective noncontrolling parties. Intercompany balances and transactions are eliminated in consolidation. Summary of Significant Accounting Policies The Company’s significant accounting policies are described in Note 1, “Description of Business and Summary of Significant Accounting Policies,” in the 2014 Annual Report on Form 10-K. Newly Adopted Accounting Pronouncements In April 2015, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) 2015-03, “Simplifying the Presentation of Debt Issuance Costs,” which requires debt issuance costs to be presented in the balance sheet as a direct deduction from the carrying value of the associated debt liability, consistent with the presentation of debt discounts or premiums. The ASU is effective for fiscal years beginning after December 15, 2015, and interim periods within those fiscal years. During the three months ended June 27, 2015, the Company elected early adoption of this standard and applied the changes retrospectively to all prior periods presented in its consolidated financial statements. The Company historically presented deferred debt issuance costs, or fees related to directly issuing debt, as assets on the consolidated balance sheets. As of June 27, 2015 and December 27, 2014, the adoption of this standard has resulted in the reclassification of $7.7 million and $5.4 million, respectively, from other assets to long-term debt, net and capital leases. These costs will continue to be amortized as interest expense over the term of the corresponding debt issuance. Newly Issued Accounting Pronouncements In April 2015, FASB issued ASU 2015-04, “Practical Expedient for the Measurement Date of an Employer’s Defined Benefit Obligation and Plan Assets” to provide a practical expedient related to the measurement date of the defined benefit plan assets and obligations. The practical expedient allows employers with fiscal year-end dates that do not coincide with a calendar month end to measure pension and post-retirement benefit plan assets and obligations as of the calendar month-end date closest to the fiscal year end. The standard requires entities that elect the practical expedient to adjust the measurement of benefit plan assets and obligations for contributions or significant events between the month-end measurement date and the entity fiscal year end. The ASU is effective for fiscal years beginning after December 15, 2015, and interim periods within those fiscal years. Early adoption is permitted. The Company is still evaluating the impact the election of the practical expedient would have on its consolidated financial statements and related disclosures. In February 2015, the FASB issued ASU 2015-02, “Amendments to the Consolidation Analysis,” which amends existing consolidation requirements. The guidance affects reporting entities that are required to evaluate whether they should consolidate certain legal entities. Specifically, the guidance amends (i) the identification of variable interests (fees paid to a decision maker or service provider), (ii) the variable interest entity characteristics for a limited partnership or similar entity and (iii) the primary beneficiary determination. The ASU is effective for fiscal years beginning after December 15, 2015, and interim periods within those fiscal years. Early adoption is permitted. The adoption of this standard is not expected to have a significant impact on the Company’s financial position or results of operations. In May 2014, the FASB issued ASU 2014-09, “Revenue from Contracts with Customers.” The standard requires an entity to recognize the amount of revenue to which it expects to be entitled for the transfer of promised goods or services to customers. The standard will replace most existing revenue recognition guidance in U.S. GAAP when it becomes effective and permits the use of either the retrospective or cumulative effect transition method. The ASU was originally effective for annual and interim periods beginning after December 15, 2016; however, on July 9, 2015, the FASB decided to defer by one year the effective date of the ASU. As a result, the standard will be effective for annual and interim periods beginning after December 15, 2017. The Company has not yet selected a transition method and is evaluating the impact the adoption will have on its consolidated financial statements and related disclosures.

Business Acquisitions

6 Months Ended

Jun. 27, 2015

Business Combinations [Abstract]

BUSINESS ACQUISITIONS

Sunrise

On May 5, 2015, the Company acquired Sunrise Farms, Inc. (Sunrise), a producer of specific pathogen free fertile chicken eggs and chickens for the manufacture of live viruses. The purpose of this business acquisition was to expand the capabilities of the Company’s existing Avian Vaccine Services business. The preliminary purchase price of the acquisition was $9.6 million and included payments for estimated working capital, which is subject to final adjustment based on the actual working capital of the acquired business as of the closing date. The acquisition was funded by cash on hand and borrowings on the Company's revolving credit facility. The business is reported in the Company's Manufacturing Support (Manufacturing) reportable segment.

The Company recorded a bargain purchase gain of $9.9 million, which represents the excess of the estimated fair value of the net assets acquired over the preliminary purchase price. The bargain purchase gain was recorded in other income (expense), net in the Company’s consolidated statement of income and was not recognized for tax purposes. The Company believes there were several factors that contributed to this transaction resulting in a bargain purchase gain, including the highly specialized nature of Sunrise’s business falling outside of the seller’s core activities and a limited pool of potential buyers.

Before recognizing the gain from the bargain purchase, the Company reassessed its initial identification and valuation of assets acquired and liabilities assumed to validate that all assets and liabilities that the Company is able to identify at the acquisition date are properly recognized.

The preliminary purchase price allocation of $9.6 million, net of less than $0.1 million of cash acquired, is as follows:



	May 5, 2015
	(in thousands)
Accounts receivable, net	$	981
Inventory	1,518
Other current assets (excluding cash)	318
Property, plant and equipment	13,866
Definite-lived intangible assets	3,400
Current liabilities	(397		)
Long-term liabilities	(250		)
Fair value of net assets acquired	19,436
Bargain purchase gain	(9,878		)
Total purchase price allocation	$	9,558

The purchase price allocations were prepared on a preliminary basis and are subject to change as additional information becomes available concerning the fair value and tax basis of the assets acquired and liabilities assumed. Any additional adjustments to the purchase price allocation will be made as soon as practicable but no later than one year from the date of acquisition.

The identifiable definite-lived intangible assets acquired represent the client relationships intangible, which is being amortized over the estimated useful life of approximately 15 years.

The Company incurred transaction and integration costs in connection with the acquisition of $0.3 million and $0.6 million during the three and six months ended June 27, 2015, respectively, which were included in selling, general and administrative expenses.

ChanTest

In October 2014, the Company acquired ChanTest Corporation (ChanTest), a leading provider of ion channel testing services to the pharmaceutical and biotech industry. The acquisition augments the Company’s early discovery capabilities and enhances the Company’s ability to support clients’ target discovery and lead optimization efforts. The preliminary purchase price of the acquisition was $59.3 million, including $0.3 million in contingent consideration. The aggregate, undiscounted amount of contingent consideration that could become payable is a maximum of $2.0 million. The Company estimated the fair value of this contingent consideration based on a probability-weighted set of outcomes. The purchase price is subject to an adjustment based on the final determined net working capital as of the closing date. The business is reported in the Company’s Discovery and Safety Assessment (DSA) reportable segment.

The preliminary purchase price allocation of $52.1 million, net of $7.2 million in cash acquired, is as follows:



	October 29, 2014
	(in thousands)
Current assets (excluding cash)	$	4,648
Property, plant and equipment	1,579
Definite-lived intangible assets	23,920
Goodwill	34,927
Current liabilities	(3,515		)
Long-term liabilities	(9,486		)
Total purchase price allocation	$	52,073

The purchase price allocations were prepared on a preliminary basis and are subject to change as additional information becomes available concerning the fair value and tax basis of the assets acquired and liabilities assumed. During the six months ended June 27, 2015, the Company recorded measurement period adjustments related to the ChanTest acquisition that resulted in an immaterial change to the purchase price allocation. Any additional adjustments to the purchase price allocation will be made as soon as practicable but no later than one year from the date of acquisition.

The breakout of definite-lived intangible assets acquired is as follows:



	October 29, 2014		Weighted average amortization life
	(in thousands)		(in years)
Client relationships	$	19,000	13
Other intangible assets	4,920		9
Total definite-lived intangible assets	$	23,920

The definite-lived intangibles are largely attributed to the expected cash flows related to client relationships existing at the acquisition closing date. The goodwill resulting from the transaction is primarily attributed to the potential growth of the business and is not deductible for tax purposes.

VivoPath

In June 2014, the Company acquired substantially all of the assets of VivoPath LLC (VivoPath), a discovery services company specializing in the rapid, in vivo compound evaluation of molecules in the therapeutic areas of metabolism, inflammation and oncology. The purchase price was $2.3 million, including $1.6 million in contingent consideration, and was allocated primarily to the intangible assets acquired. The aggregate, undiscounted amount of contingent consideration that could become payable is a maximum of $2.4 million, payable over three years based on the achievement of revenue growth targets. During the three months ended June 27, 2015, the first-year tranche of the contingent consideration of $0.6 million was earned. The Company estimated the fair value of this contingent consideration based on a probability-weighted set of outcomes. The business is reported in the Company’s DSA reportable segment.

Argenta and BioFocus

On April 1, 2014, the Company acquired (1) 100% of the shares of the United Kingdom (U.K.) based entities Argenta and BioFocus, and (2) certain Dutch assets. These businesses have formed the core of the Company’s Early Discovery business. With this acquisition, the Company has enhanced its position as a full service, early-stage contract research organization, with integrated in vitro and in vivo capabilities from target discovery through preclinical development. The purchase price of the acquisition was $191.8 million, including $0.9 million in contingent consideration. The acquisition was funded by cash on hand and borrowings on the Company’s revolving credit facility. The purchase price included payment for estimated working capital, which was subject to final adjustment based on the actual working capital of the acquired business. The businesses are reported in the Company’s DSA reportable segment.

The contingent consideration earn-out period ended on April 1, 2015. As a result, the related contingent consideration liability, as adjusted for subsequent changes in fair value, was reversed and a gain of $0.8 million was recorded in selling, general, and administrative expenses during the three months ended March 28, 2015, as no payments are expected to be made. The contingent consideration was a one-time payment that could have become payable in the second quarter of 2015 based on the achievement of a certain revenue target for the twelve-month period following the acquisition. The aggregate, undiscounted amount of contingent consideration that the Company could have paid was €5.0 million ($5.6 million as of June 27, 2015). The Company estimated the fair value of this contingent consideration based on a probability-weighted set of outcomes.

The purchase price allocation of $183.6 million, net of $8.2 million of cash acquired, was as follows (in thousands):



Current assets (excluding cash)	$	31,682
Property, plant and equipment	21,008
Other long term assets	11,140
Definite-lived intangible assets	104,470
Goodwill	65,235
Current liabilities	(13,139		)
Long term liabilities	(36,802		)
Total purchase price allocation	$	183,594

The breakout of definite-lived intangible assets acquired was as follows:



	Definite-Lived Intangible Assets		Weighted Average Amortization Life
	(in thousands)		(in years)
Client relationships	$	94,000	18
Backlog	5,900		1
Trademark and trade names	1,170		3
Leasehold interests	1,000		13
Other intangible assets	2,400		19
Total definite-lived intangible assets	$	104,470

The goodwill resulting from the transaction is primarily attributed to the potential growth of the Company’s DSA businesses from clients introduced through Argenta and BioFocus, the assembled workforce of the acquired businesses and expected cost synergies. The goodwill attributable to Argenta and BioFocus is not deductible for tax purposes. The Company incurred transaction and integration costs in connection with the acquisition of less than $0.1 million during the three and six months ended June 27, 2015 and of $1.6 million and $4.9 million during the three and six months ended June 28, 2014, respectively, which were included in selling, general and administrative expenses.

Argenta and BioFocus revenue and operating loss for the three months ended June 27, 2015 are $20.1 million and $1.7 million, respectively. Argenta and BioFocus revenue and operating loss for the six months ended June 27, 2015 are $40.7 million and $1.4 million, respectively. Argenta and BioFocus revenue and operating income for both three and six months ended June 28, 2014 are $23.5 million and less than $0.1 million, respectively, since Argenta and BioFocus were acquired on April 1, 2014.

The following selected pro forma consolidated results of operations are presented as if the Argenta and BioFocus acquisition had occurred as of the beginning of the period immediately preceding the period of acquisition after giving effect to certain adjustments, including amortization of intangible assets and depreciation of fixed assets of $3.7 million and other one-time costs. These pro forma consolidated results of operations are for informational purposes only and do not necessarily reflect the results of operations had the companies operated as one entity during the periods reported. No effect has been given for synergies, if any, that may have been realized through the acquisition.



	Three Months Ended				Six Months Ended
	June 27, 2015		June 28, 2014		June 27, 2015		June 28, 2014
	(in thousands)
Revenue	$	339,573	$	341,179	$	659,987	$	665,656
Net income attributable to common shareholders	48,509		35,264		80,050		65,688
Earnings per common share
Basic	$	1.04	$	0.75	$	1.71	$	1.40
Diluted	$	1.02	$	0.74	$	1.68	$	1.38

These pro forma results of operations have been prepared for comparative purposes only, and they do not purport to be indicative of the results of operations that actually would have resulted had the acquisition occurred on the date indicated or that may result in the future.

- Definition

The entire disclosure for a business combination (or series of individually immaterial business combinations) completed during the period, including background, timing, and recognized assets and liabilities. The disclosure may include leverage buyout transactions (as applicable).

+ References

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-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=56956791&loc=d3e4926-128472

Reference 14: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=56956515&loc=d3e1383-128463

Reference 15: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6996-128479

+ Details

Restructuring

6 Months Ended

Jun. 27, 2015

Restructuring and Related Activities [Abstract]

RESTRUCTURING

The Company periodically implements staffing reductions to improve operating efficiency at various sites.

The following table rolls forward the Company’s severance and retention cost liability:



	December 27, 2014		Expense		Payments and Adjustments			June 27, 2015
	(in thousands)
Severance and retention cost liability	$	2,666	$	1,835	$	(2,765	)	$	1,736
Total	$	2,666	$	1,835	$	(2,765	)	$	1,736

As of June 27, 2015 and December 27, 2014, $1.4 million and $2.2 million of severance and retention costs liabilities, respectively, were included in accrued compensation and $0.3 million and $0.5 million, respectively, were included in other long-term liabilities on the Company’s consolidated balance sheets.

The following table presents severance and retention costs by classification on the income statement:



	Three Months Ended				Six Months Ended
	June 27, 2015		June 28, 2014		June 27, 2015		June 28, 2014
	(in thousands)
Severance charges included in cost of revenue	$	137	$	1,072	$	667	$	2,754
Severance charges included in selling, general and administrative	568		1,817		1,168		2,035
Total expense	$	705	$	2,889	$	1,835	$	4,789

The following table presents severance and retention cost by reportable segment:



	Three Months Ended				Six Months Ended
	June 27, 2015		June 28, 2014		June 27, 2015		June 28, 2014
	(in thousands)
Research models and services	$	80	$	2,011	$	999	$	3,595
Discovery and safety assessment	456		854		475		1,049
Manufacturing support	118		24		295		24
Corporate	51		—		66		121
Total expense	$	705	$	2,889	$	1,835	$	4,789

Supplemental Balance Sheet Information

6 Months Ended

Jun. 27, 2015

Supplemental Balance Sheet Information [Abstract]

SUPPLEMENTAL BALANCE SHEET INFORMATION

The composition of trade receivables, net is as follows:



	June 27, 2015			December 27, 2014
	(in thousands)
Client receivables	$	233,569		$	219,118
Unbilled revenue	49,016			43,780
Total	282,585			262,898
Less: Allowance for doubtful accounts	(5,187		)	(4,907		)
Trade receivables, net	$	277,398		$	257,991

The composition of inventories is as follows:



	June 27, 2015		December 27, 2014
	(in thousands)
Raw materials and supplies	$	13,885	$	15,416
Work in process	12,023		11,802
Finished products	64,129		61,825
Inventories	$	90,037	$	89,043

The composition of other current assets is as follows:



	June 27, 2015		December 27, 2014
	(in thousands)
Deferred tax asset	23,058		27,644
Investments	18,074		16,167
Prepaid income tax	31,537		26,287
Restricted cash	100		2,552
Other	1,684		291
Other current assets	$	74,453	$	72,941

The composition of property, plant and equipment, net is as follows:



	June 27, 2015			December 27, 2014
	(in thousands)
Land	$	42,796		$	40,314
Buildings ⁽¹⁾	711,943			682,495
Machinery and equipment	380,871			384,713
Leasehold improvements	36,955			37,270
Furniture and fixtures	21,237			22,577
Vehicles	4,101			3,967
Computer hardware and software	122,050			119,474
Construction in progress	21,844			40,970
Total	1,341,797			1,331,780
Less: Accumulated depreciation	(661,232		)	(654,983		)
Property, plant and equipment, net	$	680,565		$	676,797

⁽¹⁾ The balance as of June 27, 2015 includes capital lease assets. See Note 8, “Long Term Debt and Capital Lease Obligations.”

Depreciation expense for both three months ended June 27, 2015 and June 28, 2014 was $17.4 million. Depreciation expense for the six months ended June 27, 2015 and June 28, 2014 was $34.5 million and $33.2 million, respectively.

The composition of other assets is as follows:



	June 27, 2015		December 27, 2014
	(in thousands)
Life insurance policies	28,237		27,603
Investments in limited partnerships	29,141		27,047
Other	5,838		18,301
Other assets	$	63,216	$	72,951

The composition of other current liabilities is as follows:



	June 27, 2015		December 27, 2014
	(in thousands)
Accrued income taxes	$	10,906	$	9,362
Current deferred tax liability	1,302		1,484
Accrued interest and other	356		233
Other current liabilities	$	12,564	$	11,079

The composition of other long-term liabilities is as follows:



	June 27, 2015		December 27, 2014
	(in thousands)
Deferred tax liability	$	25,550	$	30,816
Long-term pension liability	40,531		45,135
Accrued executive supplemental life insurance retirement plan and deferred compensation plan	33,424		33,007
Other long-term liabilities	11,751		21,403
Other long-term liabilities	$	111,256	$	130,361

Investments in Limited Partnerships and Marketable Securities

6 Months Ended

Jun. 27, 2015

Marketable Securities and Equity-Method Affiliates [Abstract]

INVESTMENTS IN LIMITED PARTNERSHIPS AND MARKETABLE SECURITIES

Investments in Limited Partnerships

The Company invests in several venture capital limited partnerships that invest in start-up companies primarily in the life sciences industry. The Company’s ownership interest in these limited partnerships ranges from 3.8% to 12.0%. The Company accounts for such investments under the equity method of accounting. The Company’s total commitment to these entities as of June 27, 2015 is $65.0 million, of which the Company has funded $23.5 million through June 27, 2015.

During the three and six months ended June 27, 2015 the Company received dividends totaling $2.1 million. During the three and six months ended June 28, 2014, the Company received dividends totaling $0.9 million and $7.4 million, respectively. The Company recognized a loss of $0.9 million and a gain of $2.1 million related to these investments for the three months ended June 27, 2015 and June 28, 2014, respectively.

Marketable Securities

The following is a summary of the Company's marketable securities, all of which are classified as available-for-sale:



	June 27, 2015
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
	(in thousands)
Mutual fund	$	4,650	$	—	$	(89	)	$	4,561
Total	$	4,650	$	—	$	(89	)	$	4,561

There were no sales of available-for-sale securities during the six months ended June 27, 2015.

Fair Value

6 Months Ended

Jun. 27, 2015

Fair Value Disclosures [Abstract]

FAIR VALUE

The Company has certain financial assets and liabilities recorded at fair value which have been classified as Level 1, 2, or 3 within the fair value hierarchy:


•	Level 1 - Fair values are determined utilizing quoted prices (unadjusted) in active markets for identical assets or liabilities that the Company has the ability to access;


•	Level 2 - Fair values are determined by utilizing quoted prices for identical or similar assets and liabilities in active markets or other market observable inputs such as interest rates, yield curves, and foreign currency spot rates;


•	Level 3 - Prices or valuations that require inputs that are both significant to the fair value measurement and unobservable.

The fair value hierarchy level is determined by asset and liability class based on the lowest level of significant input. The observability of inputs may change for certain assets or liabilities. This condition could cause an asset or liability to be reclassified between levels. The Company recognizes transfers between levels within the fair value hierarchy, if any, at the end of each quarter. During the six months ended June 27, 2015 and June 28, 2014, there were no transfers between levels.

Valuation methodologies used for assets and liabilities measured or disclosed at fair value are as follows:


•	Cash equivalents - Valued at quoted market prices determined through third-party pricing services.


•	Mutual funds - Valued at the unadjusted quoted net asset value of shares held by the Company.


•	Investments in life insurance policies - Valued at cash surrender value based on fair value of underlying investments.


•	Redeemable noncontrolling interest - Valued primarily using the income approach based on estimated future cash flows of the underlying business based on the Company’s projected financial data discounted by a weighted average cost of capital.


•	Contingent consideration- Valued based on a probability weighting of the future cash flows associated with the potential outcomes.

Assets and liabilities measured at fair value on a recurring basis are summarized below:



	June 27, 2015
	Level 1		Level 2		Level 3		Total
	(in thousands)
Cash equivalents	$	—	$	129	$	—	$	129
Marketable securities	4,561		—		—		4,561
Life insurance policies	—		21,152		—		21,152
Total assets measured at fair value	$	4,561	$	21,281	$	—	$	25,842

Redeemable noncontrolling interest	$	—	$	—	$	29,976	$	29,976
Contingent consideration	—		—		2,831		2,831
Total liabilities measured at fair value	$	—	$	—	$	32,807	$	32,807



	December 27, 2014
	Level 1		Level 2		Level 3		Total
	(in thousands)
Cash equivalents	$	—	$	1,934	$	—	$	1,934
Life insurance policies	—		20,520		—		20,520
Total assets measured at fair value	$	—	$	22,454	$	—	$	22,454

Redeemable noncontrolling interest	$	—	$	—	$	28,419	$	28,419
Contingent consideration	—		—		2,828		2,828
Total liabilities measured at fair value	$	—	$	—	$	31,247	$	31,247

Redeemable Noncontrolling Interest

The Company’s redeemable noncontrolling interest resulted from the acquisition of a 75% ownership interest in Vital River. Concurrent with the acquisition, the Company entered into a joint venture agreement with the noncontrolling interest holders that provides the Company with the right to purchase the remaining 25% of the entity for cash at its then appraised value beginning in January 2016. Additionally, the noncontrolling interest holders were granted the right to require the Company to purchase the remaining 25% of the entity at its then appraised value beginning in January 2016 for cash. These rights are accelerated in certain events. As the noncontrolling interest holders can require the Company purchase the remaining 25% interest, the noncontrolling interest is classified in the mezzanine section of the consolidated balance sheet, which is above the equity section and below liabilities.

The following table provides a rollforward of the fair value of the Company’s redeemable noncontrolling interest:



	Six Months Ended
	June 27, 2015		June 28, 2014
	(in thousands)
Beginning balance	$	28,419	$	20,581
Additions	—		—
Total gains or losses (realized/unrealized):
Net income attributable to noncontrolling interest	364		372
Foreign currency translation	112		(462		)
Change in fair value, included in additional paid-in capital	1,081		2,992
Ending balance	$	29,976	$	23,483

The significant unobservable inputs used in the fair value measurement of the Company’s redeemable noncontrolling interest are the estimated future cash flows based on projected financial data and a discount rate of 19.0%. Significant changes in the timing or amounts of the estimated future cash flows would result in a significantly higher or lower fair value measurement. Significant increases or decreases in the discount rate would result in a significantly lower or higher fair value measurement, respectively.

Contingent Consideration

The following table provides a rollforward of the contingent consideration related to the acquisitions of Argenta, BioFocus, VivoPath and ChanTest. See Note 2, “Business Acquisitions.”



	Six Months Ended
	June 27, 2015			June 28, 2014
	(in thousands)
Beginning balance	$	2,828		$	—
Additions	675			2,428
Total gains or losses (realized/unrealized):
Reversal of previously recorded contingent liability and change in fair value	(672		)	(8		)
Ending balance	$	2,831		$	2,420

The significant unobservable inputs used in the fair value measurement of the Company’s contingent consideration are the probabilities of successful achievement of certain financial targets and a discount rate. Significant increases or decreases in any of the probabilities of success would result in a significantly higher or lower fair value measurement, respectively. Significant increases or decreases in the discount rate would result in a significantly lower or higher fair value measurement, respectively.

Debt Instruments

The book value of the Company’s term and revolving loans, which are variable rate loans carried at amortized cost, approximates their fair value based on current market pricing of similar debt. As the fair value is based on significant other observable inputs, including current interest and foreign currency exchange rates, it is deemed to be Level 2.

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References + Details

Goodwill and Other Intangible Assets

6 Months Ended

Jun. 27, 2015

Goodwill and Intangible Assets Disclosure [Abstract]

GOODWILL AND OTHER INTANGIBLE ASSETS

Goodwill

The following table provides a rollforward of the Company’s goodwill:



			Adjustments to Goodwill
	December 27, 2014		Acquisitions			Foreign Exchange			June 27, 2015
	(in thousands)
Research Models and Services	$	59,196	$	—		$	(253	)	$	58,943
Discovery and Safety Assessment	229,302		(624		)	(1,533		)	227,145
Manufacturing Support	32,579		187			(1,440		)	31,326
Total	$	321,077	$	(437	)	$	(3,226	)	$	317,414

Other Intangible Assets, net

The following table displays other intangible assets, net by major class:



	June 27, 2015							December 27, 2014
	Gross		Accumulated Amortization			Net		Gross		Accumulated Amortization			Net
	(in thousands)
Backlog	$	8,903	$	(8,538	)	$	365	$	8,728	$	(6,636	)	$	2,092
Client relationships	375,465		(219,111		)	156,354		379,339		(217,938		)	161,401
Trademarks and trade names	6,599		(5,584		)	1,015		6,603		(5,314		)	1,289
Standard operating procedures	2,303		(1,844		)	459		2,309		(1,642		)	667
Other identifiable intangible assets	16,408		(5,663		)	10,745		16,334		(6,346		)	9,988
Total definite-lived intangible assets	409,678		(240,740		)	168,938		413,313		(237,876		)	175,437
Indefinite-lived intangibles assets						3,438							3,438
Total other intangibles assets, net						$	172,376						$	178,875

- Definition

The entire disclosure for the aggregate amount of goodwill and a description of intangible assets, which may include (a) for amortizable intangible assets (also referred to as finite-lived intangible assets), the carrying amount, the amount of any significant residual value, and the weighted-average amortization period, (b) for intangible assets not subject to amortization (also referred to as indefinite-lived intangible assets), the carrying amount, and (c) the amount of research and development assets acquired and written off in the period, including the line item in the income statement in which the amounts written off are aggregated, if not readily apparent from the income statement. Also discloses (a) for amortizable intangibles assets in total and by major class, the gross carrying amount and accumulated amortization, the total amortization expense for the period, and the estimated aggregate amortization expense for each of the five succeeding fiscal years, (b) for intangible assets not subject to amortization the carrying amount in total and by major class, and (c) for goodwill, in total and for each reportable segment, the changes in the carrying amount of goodwill during the period (including the aggregate amount of goodwill acquired, the aggregate amount of impairment losses recognized, and the amount of goodwill included in the gain (loss) on disposal of a reporting unit). If any part of goodwill has not been allocated to a reportable segment, discloses the unallocated amount and the reasons for not allocating. For each impairment loss recognized related to an intangible asset (excluding goodwill), discloses: (a) a description of the impaired intangible asset and the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method for determining fair value, (c) the caption in the income statement or the statement of activities in which the impairment loss is aggregated, and (d) the segment in which the impaired intangible asset is reported. For each goodwill impairment loss recognized, discloses: (a) a description of the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method of determining the fair value of the associated reporting unit, and (c) if a recognized impairment loss is an estimate not finalized and the reasons why the estimate is not final. May also disclose the nature and amount of any significant adjustments made to a previous estimate of an impairment loss.

+ References + Details

Long-Term Debt and Capital Lease Obligations

6 Months Ended

Jun. 27, 2015

Debt Disclosure [Abstract]

LONG-TERM DEBT AND CAPITAL LEASE OBLIGATIONS

Long-Term Debt

Long-term debt, net consists of the following:



	June 27, 2015			December 27, 2014
	(in thousands)
Term loans	$	400,000		$	378,000
Revolving credit facility	342,888			375,536
Other long-term debt	196			214
Total debt	743,084			753,750
Less: current portion of long-term debt	(15,196		)	(31,714		)
Long-term debt	727,888			722,036
Debt discount and debt issuance costs ⁽¹⁾	(7,670		)	(5,401		)
Long-term debt, net	$	720,218		$	716,635

⁽¹⁾During the three months ended June 27, 2015, the Company adopted ASU 2015-03 and reclassified unamortized debt issuance costs from other assets to long-term debt, net and capital leases. See Note 1, “Basis of Presentation” for further discussion.

In April 2015, the Company amended and restated the $970M Credit Facility creating a $1.3 billion facility ($1.3B Credit Facility) that provides for a $400.0 million term loan facility and $900.0 million multi-currency revolving facility. The term loan facility matures in 20 quarterly installments with the last installment due April 22, 2020. The revolving facility matures on April 22, 2020 and requires no scheduled payment before that date.

The interest rates applicable to term loans and revolving loans under our credit agreement are, at our option, equal to either the base rate (which is the higher of (1) the prime rate, (2) the federal funds rate plus 0.5% or (3) the one-month adjusted LIBOR rate) or the adjusted LIBOR rate plus an interest rate margin based upon the our leverage ratio. As of June 27, 2015 and December 27, 2014, the weighted average interest rate on the Company’s debt was 1.31% and 1.42%, respectively.

The $1.3B Credit Facility includes certain customary representations and warranties, events of default, notices of material adverse changes to the Company’s business, and negative and affirmative covenants. As of June 27, 2015, the Company was compliant with all covenants.

At June 27, 2015 and December 27, 2014, the Company had $4.9 million and $5.0 million in outstanding letters of credit, respectively.

Capital Lease Obligations

The Company acquired a built-to-suit lease as part of its acquisition of Argenta and BioFocus. In accordance with accounting guidance applicable to entities involved with the construction of an asset that will be leased when the construction is completed, the Company was considered the owner, for accounting purposes, of this property during the construction period. Accordingly, the Company recorded an asset and a corresponding financing obligation on its consolidated balance sheet for the amount of total project costs incurred related to the construction in progress for this property through completion of the construction period. Upon completion of the construction, the Company determined that it is no longer considered the owner of the property because it did not have continuing involvement. Consequently, the Company recorded a successful sale leaseback and derecognized the property and the associated financing obligation from the Company’s consolidated balance sheet and recorded a capital lease asset and a corresponding liability of $35.8 million.

The Company’s capital lease obligations amounted to $37.4 million and $1.0 million at June 27, 2015 and December 27, 2014, respectively.

Equity

6 Months Ended

Jun. 27, 2015

Equity [Abstract]

EQUITY

The following table reconciles the numerator and denominator in the computations of basic and diluted earnings per share:



	Three Months Ended						Six Months Ended
	June 27, 2015			June 28, 2014			June 27, 2015			June 28, 2014
	(in thousands)
Numerator:
Net income from continuing operations attributable to common shareholders	$	48,516		$	35,908		$	80,064		$	68,410
Loss from discontinued operations, net of income taxes	(7		)	(644		)	(14		)	(914		)
Net income attributable to common shareholders	$	48,509		$	35,264		$	80,050		$	67,496

Denominator:
Weighted-average shares outstanding—Basic	46,675			46,942			46,712			47,016
Effect of dilutive securities:
Stock options, restricted stock units, performance stock units and contingently issuable restricted stock	875			742			1,006			893
Weighted-average shares outstanding—Diluted	47,550			47,684			47,718			47,909

Earnings Per Share

Options to purchase approximately 0.5 million and 0.9 million shares were outstanding at both June 27, 2015 and June 28, 2014, respectively, but were not included in computing diluted earnings per share because their inclusion would have been anti-dilutive. Basic weighted average shares outstanding for both the three and six months ended June 27, 2015 and June 28, 2014 excluded the weighted average impact of approximately 1.1 million and 1.2 million shares, respectively, of non-vested restricted stock and restricted stock units.

Treasury Shares

In July 2010, the Company’s Board of Directors authorized a $500.0 million stock repurchase program, and subsequently approved increases to the stock repurchase program of $250.0 million in 2010, $250.0 million in 2013 and $150.0 million in 2014 for an aggregate authorization of $1,150.0 million. The Company repurchased approximately 1.2 million shares for $90.8 million and approximately 1.7 million shares for $90.3 million in the six months ended June 27, 2015 and June 28, 2014, respectively. As of June 27, 2015, the Company had $87.6 million remaining on the authorized stock repurchase program. The Company’s 2007 Incentive Plan permits the netting of common stock upon vesting of restricted stock and restricted stock units in order to satisfy individual minimum statutory tax withholding requirements. During the six months ended June 27, 2015 and June 28, 2014, the Company acquired approximately 0.1 million shares for $8.7 million and approximately 0.1 million shares for $6.7 million, respectively.

Accumulated Other Comprehensive Income (Loss)

Changes to each component of accumulated other comprehensive income (loss), net of income tax, are as follows:



	Foreign Currency Translation and Other			Pension and Other Post-Retirement Benefit Plans			Total
	(in thousands)
December 27, 2014	$	(19,891	)	$	(54,356	)	$	(74,247	)
Other comprehensive loss before reclassifications	(14,785		)	—			(14,785		)
Amounts reclassified from accumulated other comprehensive income (loss)	(2,341		)	1,490			(851		)
Net current period other comprehensive income (loss)	(17,126		)	1,490			(15,636		)
Income tax expense	—			480			480
June 27, 2015	$	(37,017	)	$	(53,346	)	$	(90,363	)

Foreign currency translation and other includes an insignificant amount of unrealized gains (losses) on available-for-sale marketable securities.

Nonredeemable Noncontrolling Interests

The Company has investments in several entities, whose financial results are consolidated in the Company’s financial statements, as it has the ability to exercise control over these entities. The interests of the respective noncontrolling parties in these entities have been recorded as noncontrolling interests. The activity within the nonredeemable noncontrolling interests was insignificant during the three and six months ended June 27, 2015 and June 28, 2014.

- Definition

The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(d),(e))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21484-112644

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SAB TOPIC 4.E)
-URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74512-122707

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21488-112644

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.29-31)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 4
-Subparagraph (SAB TOPIC 4.C)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187143-122770

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21506-112644

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 30
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23285-112656

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Preferred Stock
-URI http://asc.fasb.org/extlink&oid=6521494

Reference 12: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644

Reference 13: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
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-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21564-112644

Reference 14: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 4
-Section E

Reference 15: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 4
-Section C

+ Details

Income Taxes

6 Months Ended

Jun. 27, 2015

Income Tax Disclosure [Abstract]

INCOME TAXES

The Company’s overall effective tax rate for the three months ended June 27, 2015 and June 28, 2014 was 18.4% and 27.9%, respectively. The Company’s overall effective tax rate was 12.4% and 26.1% for each of the six months ended June 27, 2015 and June 28, 2014, respectively. For the three months ended June 27, 2015 the decrease was primarily attributable to a $1.8 million release of an uncertain tax position resulting from an ability to offset tax on a capital gain from an investment in a limited partnership, the non-taxable bargain purchase gain of $9.9 million associated with the acquisition of Sunrise, and a prior year discrete tax cost of $1.4 million related to nondeductible transaction costs. For the six months ended June 27, 2015, the decrease reflects the items above as well as a reduction in unrecognized tax benefits and related interest of $10.4 million due to the expiration of the statute of limitations associated with pre-acquisition tax positions on forgiveness of debt.

During the three months ended June 27, 2015, the Company’s unrecognized tax benefits decreased by $0.1 million to $23.0 million primarily due to the $1.8 million release resulting from an ability to offset tax on a capital gain from an investment in a limited partnership, offset by the current year reserve associated with Canadian research credits and unfavorable foreign exchange movement. The amount of unrecognized income tax benefits that would impact the effective tax rate decreased by $0.4 million, to $20.1 million. The amount of accrued interest on unrecognized tax benefits was $1.0 million at June 27, 2015. The Company believes that it is reasonably possible that the unrecognized tax benefits will decrease by up to $0.2 million over the next twelve-month period, as a result of the settlement of audits.

The Company conducts business in a number of tax jurisdictions. As a result, it is subject to tax audits in jurisdictions including the U.S., U.K., Japan, France, Germany, and Canada. With few exceptions, the Company is no longer subject to U.S. and international income tax examinations for years before 2011.

The Company and certain of its subsidiaries are currently under audit by various tax authorities in the U.S., Canada, and France. The Company does not believe that resolution of these controversies will have a material impact on its financial position or results of operations.

On December 2, 2014, the Quebec government released Information Bulletin 2014-11, which elaborated on a proposed law change to its SR&ED credit that, if passed, would provide a one-time retroactive benefit to operating income in the year of enactment and would provide a corresponding increase to the Company’s effective income tax rate. If passed as proposed, the tax law change would also provide an ongoing reduction in benefit to operating income and an additional corresponding increase to the Company’s effective income tax rate in the year of enactment and beyond.

In accordance with the Company’s policy, the remaining undistributed earnings of its non-U.S. subsidiaries remain indefinitely reinvested as of the end of the three months ended June 27, 2015 as they are required to fund needs outside the U.S. and cannot be repatriated in a manner that is substantially tax free.

The income tax expense (benefit) related to items of other comprehensive income are as follows:



	Three Months Ended				Six Months Ended
	June 27, 2015		June 28, 2014		June 27, 2015		June 28, 2014
	(in thousands)
Income tax benefit related to foreign currency translation adjustment	$	—	$	—	$	—	$	(105	)
Income tax expense related to change in unrecognized pension gains, losses and prior service costs	263		129		480		253
Income tax expense related to items of other comprehensive income	$	263	$	129	$	480	$	148

Pension and Other Post-Retirement Benefit Plans

6 Months Ended

Jun. 27, 2015

Compensation and Retirement Disclosure [Abstract]

PENSION AND OTHER POST-RETIREMENT BENEFIT PLANS

The following table provides the components of net periodic cost (benefit) for the Company’s pension and other post-retirement benefit plans for the three months ended June 27, 2015 and June 28, 2014:



	Pension Plans						Other Post-Retirement Benefit Plans
	June 27, 2015			June 28, 2014			June 27, 2015		June 28, 2014
	(in thousands)
Service cost	$	936		$	843		$	214	$	190
Interest cost	3,070			3,211			266		253
Expected return on plan assets	(4,382		)	(4,277		)	—		—
Amortization of prior service cost (credit)	(150		)	(159		)	—		165
Amortization of net loss	841			223			70		62
Net periodic cost (benefit)	$	315		$	(159	)	$	550	$	670

The following table provides the components of net periodic cost (benefit) for the Company’s pension and other post-retirement benefit plans for the six months ended June 27, 2015 and June 28, 2014:



	Pension Plans						Other Post-Retirement Benefit Plans
	June 27, 2015			June 28, 2014			June 27, 2015		June 28, 2014
	(in thousands)
Service cost	$	1,871		$	1,685		428		$	379
Interest cost	6,140			6,422			531		505
Expected return on plan assets	(8,764		)	(8,555		)	—		—
Amortization of prior service cost (credit)	(301		)	(318		)	—		330
Amortization of net loss	1,653			446			138		125
Net periodic cost (benefit)	$	599		$	(320	)	$	1,097	$	1,339

Stock Plans and Stock-Based Compensation

6 Months Ended

Jun. 27, 2015

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

STOCK-BASED COMPENSATION

The Company has stock-based compensation plans under which employees and non-employee directors may be granted stock-based awards such as stock options, restricted stock, restricted stock units and performance share units (PSUs).

The following table provides stock-based compensation by the financial statement line item in which it is reflected:



	Three Months Ended						Six Months Ended
	June 27, 2015			June 28, 2014			June 27, 2015			June 28, 2014
	(in thousands)
Cost of revenue	$	1,788		$	1,318		$	3,289		$	2,671
Selling, general and administrative	8,411			6,904			16,584			12,210
Stock-based compensation, before income taxes	10,199			8,222			19,873			14,881
Provision for income taxes	(3,619		)	(2,964		)	(7,004		)	(5,328		)
Stock-based compensation, net of income tax	$	6,580		$	5,258		$	12,869		$	9,553

During the six months ended June 27, 2015, the Company issued approximately 0.2 million restricted stock units with a per share weighted average grant date fair value of $76.67, less than 0.1 million shares of restricted stock with a per share weighted average grant date fair value of $70.29, approximately 0.5 million stock options with a per share weighted average grant date fair value of $17.27, and approximately 0.2 million PSUs with a per share weighted average grant date fair value of $87.50. The maximum number of common shares to be issued upon vesting of PSUs granted during the six months ended June 27, 2015 is approximately 0.3 million.

During the three months ended March 28, 2015, the Company modified certain stock-based awards granted in previous years as part of executive retirement transitions. For the stock-based awards granted to employees during the six months ended June 27, 2015 the Company introduced a new retirement provision, which allows for continued vesting of such awards after the employee’s retirement if certain eligibility conditions are met. The introduction of the new retirement provision and stock-based award modifications increased the Company’s stock-based compensation expense for the six months ended June 27, 2015 by $2.6 million.

Commitments and Contingencies	6 Months Ended
Commitments and Contingencies	Jun. 27, 2015
Commitments and Contingencies Disclosure [Abstract]
COMMITMENTS AND CONTINGENCIES	COMMITMENTS AND CONTINGENCIES Litigation Various lawsuits, claims, and proceedings of a nature considered normal to its business are pending against the Company. While the outcome of any of these proceedings cannot be accurately predicted, the Company does not believe the ultimate resolution of any of these existing matters would have a material adverse effect on the Company’s business or financial condition. In May 2013, the Company commenced an investigation into inaccurate billing with respect to certain government contracts. The Company promptly reported these matters to the relevant government contracting officers, the Department of Health and Human Services’ Office of the Inspector General, and the Department of Justice, and the Company is cooperating with these agencies to ensure the proper repayment and resolution of this matter. The Company identified approximately $1.5 million of excess amounts billed on these contracts since January 1, 2007 and reserved such amount. Because of the ongoing discussions with the government and complex nature of this matter, the Company believes that it is reasonably possible that additional losses may be incurred; however, the Company cannot at this time estimate the potential range of loss beyond the current reserve of $1.5 million. Lease Commitments During the six months ended June 27, 2015, the Company entered into new lease agreements or exercised options to extend the lease terms for certain existing leases. As a result, the Company’s lease obligations through May 2020 increased by $10.1 million.

Segment Information

6 Months Ended

Jun. 27, 2015

Segment Reporting [Abstract]

SEGMENT INFORMATION

The Company reports its financial performance in three segments: Research Models and Services, Discovery and Safety Assessment and Manufacturing Support.

The following table presents revenue and other financial information by reportable segment:



	Three Months Ended				Six Months Ended
	June 27, 2015		June 28, 2014		June 27, 2015		June 28, 2014
	(in thousands)
Research Models and Services
Revenue	$	120,044	$	133,120	$	240,055	$	265,615
Gross margin	49,707		52,450		95,511		104,097
Operating income	33,461		34,234		62,306		69,678
Depreciation and amortization	5,348		6,559		11,393		13,000
Capital expenditures	6,356		3,319		9,089		7,418
Discovery and Safety Assessment
Revenue	$	153,375	$	142,614	$	293,387	$	247,752
Gross margin	49,256		39,457		92,939		65,116
Operating income	28,149		17,798		51,665		29,511
Depreciation and amortization	12,412		12,385		23,551		20,527
Capital expenditures	4,101		3,858		9,479		7,894
Manufacturing Support
Revenue	$	66,154	$	65,445	$	126,545	$	127,180
Gross margin	33,820		33,727		63,993		65,234
Operating income	20,431		20,455		37,229		38,871
Depreciation and amortization	3,609		3,484		6,895		7,112
Capital expenditures	1,770		1,717		3,336		3,981

For the three months ended June 27, 2015, reconciliations of segment operating income, depreciation and amortization, and capital expenditures to the respective consolidated amounts are as follows:



	Operating Income						Depreciation and Amortization				Capital Expenditures
	June 27, 2015			June 28, 2014			June 27, 2015		June 28, 2014		June 27, 2015		June 28, 2014
	(in thousands)
Total reportable segments	$	82,041		$	72,487		$	21,369	$	22,428	$	12,227	$	8,894
Unallocated corporate	(26,306		)	(21,462		)	1,779		1,874		1,681		421
Total consolidated	$	55,735		$	51,025		$	23,148	$	24,302	$	13,908	$	9,315

For the six months ended June 27, 2015, reconciliations of segment operating income, depreciation and amortization, and capital expenditures to the respective consolidated amounts are as follows:



	Operating Income						Depreciation and Amortization				Capital Expenditures
	June 27, 2015			June 28, 2014			June 27, 2015		June 28, 2014		June 27, 2015		June 28, 2014
	(in thousands)
Total reportable segments	$	151,200		$	138,060		$	41,839	$	40,639	$	21,904	$	19,293
Unallocated corporate	(52,460		)	(47,329		)	3,677		3,713		2,652		1,212
Total consolidated	$	98,740		$	90,731		$	45,516	$	44,352	$	24,556	$	20,505

Revenue for each significant product or service area is as follows:



	Three Months Ended				Six Months Ended
	June 27, 2015		June 28, 2014		June 27, 2015		June 28, 2014
	(in thousands)
Research models and services	$	120,044	$	133,120	$	240,055	$	265,615
Discovery and safety assessment	153,375		142,614		293,387		247,752
Endotoxin and Microbial Detection	33,653		33,579		66,479		66,045
Other manufacturing support	32,501		31,866		60,066		61,135
Manufacturing support	66,154		65,445		126,545		127,180
Total revenue	$	339,573	$	341,179	$	659,987	$	640,547

A summary of unallocated corporate overhead consists of the following:



	Three Months Ended				Six Months Ended
	June 27, 2015		June 28, 2014		June 27, 2015		June 28, 2014
	(in thousands)
Stock-based compensation expense	$	6,419	$	4,905	$	12,699	$	8,607
Salary, bonus and fringe	7,234		7,438		17,930		17,705
Consulting, audit and professional services	3,130		2,437		6,771		5,668
IT related expenses	1,685		1,323		3,549		2,900
Depreciation expense	1,779		1,874		3,677		3,713
Acquisition related adjustments	3,956		1,371		3,594		4,676
Other general unallocated corporate expenses	2,103		2,114		4,240		4,060
Total unallocated corporate overhead costs	$	26,306	$	21,462	$	52,460	$	47,329

Other general unallocated corporate expenses consist of various departmental costs including those associated with departments such as senior executives, corporate accounting, legal, tax, human resources, treasury, and investor relations.

- Definition

The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 34
-URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e8981-108599

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e9038-108599

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 5: http://www.xbrl.org/2003/role/presentationRef
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-URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e8380-108599

Reference 6: http://www.xbrl.org/2003/role/presentationRef
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-URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e8933-108599

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-SubTopic 10
-Section 50
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-URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e8844-108599

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
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-URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e8984-108599

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 40
-URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e9031-108599

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Name Accounting Standards Codification
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Reference 13: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 14: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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+ Details

Subsequent Events	6 Months Ended
Subsequent Events	Jun. 27, 2015
Subsequent Events [Abstract]
SUBSEQUENT EVENTS	SUBSEQUENT EVENTS On July 24, 2015, the Company acquired Celsis International Ltd. (Celsis), a leading provider of rapid testing systems for non-sterile bacterial contamination for the biopharmaceutical and consumer products industries. The purpose of this acquisition was to expand the portfolio of the Company’s Endotoxin and Microbial Detection (EMD) business. The preliminary purchase price for Celsis was $212.0 million in cash, which is subject to a final net working capital adjustment as of the closing date. The business will be reported in the Company’s Manufacturing reportable segment. Due to the limited time between the acquisition date and the filing of this Quarterly Report on Form 10-Q, it is not practicable for the Company to disclose the preliminary allocation of purchase price to assets acquired and liabilities assumed.

Basis of Presentation - Significant Accounting Policies (Policies)	6 Months Ended
	Jun. 27, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Use of Estimates	The preparation of condensed consolidated financial statements in accordance with U.S. GAAP requires that the Company make estimates and judgments that may affect the reported amounts of assets, liabilities, revenues, expenses, and related disclosure of contingent assets and liabilities. On an on-going basis, the Company evaluates its estimates, judgments and methodologies. The Company bases its estimates on historical experience and on various other assumptions that are believed to be reasonable, the results of which form the basis for making judgments about the carrying values of assets and liabilities. Actual results may differ from these estimates under different assumptions or conditions. Changes in estimates are reflected in reported results in the period in which they become known.
Consolidation	The Company’s consolidated financial statements reflect its financial statements and those of its subsidiaries in which the Company holds a controlling financial interest. For consolidated entities in which the Company owns or is exposed to less than 100% of the economics, the Company records net income (loss) attributable to noncontrolling interests in its consolidated statements of income equal to the percentage of the economic or ownership interest retained in such entities by the respective noncontrolling parties. Intercompany balances and transactions are eliminated in consolidation.
Newly Adopted and Issued Accounting Pronouncements	In April 2015, FASB issued ASU 2015-04, “Practical Expedient for the Measurement Date of an Employer’s Defined Benefit Obligation and Plan Assets” to provide a practical expedient related to the measurement date of the defined benefit plan assets and obligations. The practical expedient allows employers with fiscal year-end dates that do not coincide with a calendar month end to measure pension and post-retirement benefit plan assets and obligations as of the calendar month-end date closest to the fiscal year end. The standard requires entities that elect the practical expedient to adjust the measurement of benefit plan assets and obligations for contributions or significant events between the month-end measurement date and the entity fiscal year end. The ASU is effective for fiscal years beginning after December 15, 2015, and interim periods within those fiscal years. Early adoption is permitted. The Company is still evaluating the impact the election of the practical expedient would have on its consolidated financial statements and related disclosures. In February 2015, the FASB issued ASU 2015-02, “Amendments to the Consolidation Analysis,” which amends existing consolidation requirements. The guidance affects reporting entities that are required to evaluate whether they should consolidate certain legal entities. Specifically, the guidance amends (i) the identification of variable interests (fees paid to a decision maker or service provider), (ii) the variable interest entity characteristics for a limited partnership or similar entity and (iii) the primary beneficiary determination. The ASU is effective for fiscal years beginning after December 15, 2015, and interim periods within those fiscal years. Early adoption is permitted. The adoption of this standard is not expected to have a significant impact on the Company’s financial position or results of operations. In May 2014, the FASB issued ASU 2014-09, “Revenue from Contracts with Customers.” The standard requires an entity to recognize the amount of revenue to which it expects to be entitled for the transfer of promised goods or services to customers. The standard will replace most existing revenue recognition guidance in U.S. GAAP when it becomes effective and permits the use of either the retrospective or cumulative effect transition method. The ASU was originally effective for annual and interim periods beginning after December 15, 2016; however, on July 9, 2015, the FASB decided to defer by one year the effective date of the ASU. As a result, the standard will be effective for annual and interim periods beginning after December 15, 2017. The Company has not yet selected a transition method and is evaluating the impact the adoption will have on its consolidated financial statements and related disclosures. In April 2015, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) 2015-03, “Simplifying the Presentation of Debt Issuance Costs,” which requires debt issuance costs to be presented in the balance sheet as a direct deduction from the carrying value of the associated debt liability, consistent with the presentation of debt discounts or premiums. The ASU is effective for fiscal years beginning after December 15, 2015, and interim periods within those fiscal years. During the three months ended June 27, 2015, the Company elected early adoption of this standard and applied the changes retrospectively to all prior periods presented in its consolidated financial statements. The Company historically presented deferred debt issuance costs, or fees related to directly issuing debt, as assets on the consolidated balance sheets. As of June 27, 2015 and December 27, 2014, the adoption of this standard has resulted in the reclassification of $7.7 million and $5.4 million, respectively, from other assets to long-term debt, net and capital leases. These costs will continue to be amortized as interest expense over the term of the corresponding debt issuance.

Business Acquisitions (Tables)

6 Months Ended

Jun. 27, 2015

Business Combinations [Abstract]

Schedule of Business Acquisitions, by Acquisition

The preliminary purchase price allocation of $52.1 million, net of $7.2 million in cash acquired, is as follows:



	October 29, 2014
	(in thousands)
Current assets (excluding cash)	$	4,648
Property, plant and equipment	1,579
Definite-lived intangible assets	23,920
Goodwill	34,927
Current liabilities	(3,515		)
Long-term liabilities	(9,486		)
Total purchase price allocation	$	52,073

The preliminary purchase price allocation of $9.6 million, net of less than $0.1 million of cash acquired, is as follows:



	May 5, 2015
	(in thousands)
Accounts receivable, net	$	981
Inventory	1,518
Other current assets (excluding cash)	318
Property, plant and equipment	13,866
Definite-lived intangible assets	3,400
Current liabilities	(397		)
Long-term liabilities	(250		)
Fair value of net assets acquired	19,436
Bargain purchase gain	(9,878		)
Total purchase price allocation	$	9,558

Finite-Lived and Indefinite-Lived Intangible Assets Acquired as Part of Business Combination

The breakout of definite-lived intangible assets acquired is as follows:



	October 29, 2014		Weighted average amortization life
	(in thousands)		(in years)
Client relationships	$	19,000	13
Other intangible assets	4,920		9
Total definite-lived intangible assets	$	23,920

Schedule of Assets and Liabilities Acquired

The purchase price allocation of $183.6 million, net of $8.2 million of cash acquired, was as follows (in thousands):



Current assets (excluding cash)	$	31,682
Property, plant and equipment	21,008
Other long term assets	11,140
Definite-lived intangible assets	104,470
Goodwill	65,235
Current liabilities	(13,139		)
Long term liabilities	(36,802		)
Total purchase price allocation	$	183,594

Schedule of Finite-Lived Intangible Assets Acquired as Part of Business Combination

The breakout of definite-lived intangible assets acquired was as follows:



	Definite-Lived Intangible Assets		Weighted Average Amortization Life
	(in thousands)		(in years)
Client relationships	$	94,000	18
Backlog	5,900		1
Trademark and trade names	1,170		3
Leasehold interests	1,000		13
Other intangible assets	2,400		19
Total definite-lived intangible assets	$	104,470

Business Acquisition, Pro Forma Information



	Three Months Ended				Six Months Ended
	June 27, 2015		June 28, 2014		June 27, 2015		June 28, 2014
	(in thousands)
Revenue	$	339,573	$	341,179	$	659,987	$	665,656
Net income attributable to common shareholders	48,509		35,264		80,050		65,688
Earnings per common share
Basic	$	1.04	$	0.75	$	1.71	$	1.40
Diluted	$	1.02	$	0.74	$	1.68	$	1.38

Restructuring (Tables)

6 Months Ended

Jun. 27, 2015

Restructuring and Related Activities [Abstract]

Severance Costs, Liability

The following table rolls forward the Company’s severance and retention cost liability:



	December 27, 2014		Expense		Payments and Adjustments			June 27, 2015
	(in thousands)
Severance and retention cost liability	$	2,666	$	1,835	$	(2,765	)	$	1,736
Total	$	2,666	$	1,835	$	(2,765	)	$	1,736

Severance Costs, By Classification

The following table presents severance and retention costs by classification on the income statement:



	Three Months Ended				Six Months Ended
	June 27, 2015		June 28, 2014		June 27, 2015		June 28, 2014
	(in thousands)
Severance charges included in cost of revenue	$	137	$	1,072	$	667	$	2,754
Severance charges included in selling, general and administrative	568		1,817		1,168		2,035
Total expense	$	705	$	2,889	$	1,835	$	4,789

Severance Costs, By Segment

The following table presents severance and retention cost by reportable segment:



	Three Months Ended				Six Months Ended
	June 27, 2015		June 28, 2014		June 27, 2015		June 28, 2014
	(in thousands)
Research models and services	$	80	$	2,011	$	999	$	3,595
Discovery and safety assessment	456		854		475		1,049
Manufacturing support	118		24		295		24
Corporate	51		—		66		121
Total expense	$	705	$	2,889	$	1,835	$	4,789

Supplemental Balance Sheet Information (Tables)

6 Months Ended

Jun. 27, 2015

Supplemental Balance Sheet Information [Abstract]

Composition of Net Trade Receivables

The composition of trade receivables, net is as follows:



	June 27, 2015			December 27, 2014
	(in thousands)
Client receivables	$	233,569		$	219,118
Unbilled revenue	49,016			43,780
Total	282,585			262,898
Less: Allowance for doubtful accounts	(5,187		)	(4,907		)
Trade receivables, net	$	277,398		$	257,991

Composition of Inventories

The composition of inventories is as follows:



	June 27, 2015		December 27, 2014
	(in thousands)
Raw materials and supplies	$	13,885	$	15,416
Work in process	12,023		11,802
Finished products	64,129		61,825
Inventories	$	90,037	$	89,043

Composition of Other Current Assets

The composition of other current assets is as follows:



	June 27, 2015		December 27, 2014
	(in thousands)
Deferred tax asset	23,058		27,644
Investments	18,074		16,167
Prepaid income tax	31,537		26,287
Restricted cash	100		2,552
Other	1,684		291
Other current assets	$	74,453	$	72,941

Composition of Net Property, Plant and Equipment

The composition of property, plant and equipment, net is as follows:



	June 27, 2015			December 27, 2014
	(in thousands)
Land	$	42,796		$	40,314
Buildings ⁽¹⁾	711,943			682,495
Machinery and equipment	380,871			384,713
Leasehold improvements	36,955			37,270
Furniture and fixtures	21,237			22,577
Vehicles	4,101			3,967
Computer hardware and software	122,050			119,474
Construction in progress	21,844			40,970
Total	1,341,797			1,331,780
Less: Accumulated depreciation	(661,232		)	(654,983		)
Property, plant and equipment, net	$	680,565		$	676,797

⁽¹⁾ The balance as of June 27, 2015 includes capital lease assets. See Note 8, “Long Term Debt and Capital Lease Obligations.”

Composition of Other Assets

The composition of other assets is as follows:



	June 27, 2015		December 27, 2014
	(in thousands)
Life insurance policies	28,237		27,603
Investments in limited partnerships	29,141		27,047
Other	5,838		18,301
Other assets	$	63,216	$	72,951

Composition of Current Liabilities

The composition of other current liabilities is as follows:



	June 27, 2015		December 27, 2014
	(in thousands)
Accrued income taxes	$	10,906	$	9,362
Current deferred tax liability	1,302		1,484
Accrued interest and other	356		233
Other current liabilities	$	12,564	$	11,079

Composition of Other Long-Term Liabilities

The composition of other long-term liabilities is as follows:



	June 27, 2015		December 27, 2014
	(in thousands)
Deferred tax liability	$	25,550	$	30,816
Long-term pension liability	40,531		45,135
Accrued executive supplemental life insurance retirement plan and deferred compensation plan	33,424		33,007
Other long-term liabilities	11,751		21,403
Other long-term liabilities	$	111,256	$	130,361

Investments in Limited Partnerships and Marketable Securities (Tables)

6 Months Ended

Jun. 27, 2015

Marketable Securities and Equity-Method Affiliates [Abstract]

Schedule of Available-for-sale Securities Reconciliation

The following is a summary of the Company's marketable securities, all of which are classified as available-for-sale:



	June 27, 2015
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
	(in thousands)
Mutual fund	$	4,650	$	—	$	(89	)	$	4,561
Total	$	4,650	$	—	$	(89	)	$	4,561

Fair Value (Tables)

6 Months Ended

Jun. 27, 2015

Fair Value Disclosures [Abstract]

Summary of Assets and Liabilities Measured at Fair Value on a Recurring Basis

Assets and liabilities measured at fair value on a recurring basis are summarized below:



	June 27, 2015
	Level 1		Level 2		Level 3		Total
	(in thousands)
Cash equivalents	$	—	$	129	$	—	$	129
Marketable securities	4,561		—		—		4,561
Life insurance policies	—		21,152		—		21,152
Total assets measured at fair value	$	4,561	$	21,281	$	—	$	25,842

Redeemable noncontrolling interest	$	—	$	—	$	29,976	$	29,976
Contingent consideration	—		—		2,831		2,831
Total liabilities measured at fair value	$	—	$	—	$	32,807	$	32,807



	December 27, 2014
	Level 1		Level 2		Level 3		Total
	(in thousands)
Cash equivalents	$	—	$	1,934	$	—	$	1,934
Life insurance policies	—		20,520		—		20,520
Total assets measured at fair value	$	—	$	22,454	$	—	$	22,454

Redeemable noncontrolling interest	$	—	$	—	$	28,419	$	28,419
Contingent consideration	—		—		2,828		2,828
Total liabilities measured at fair value	$	—	$	—	$	31,247	$	31,247

Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation

The following table provides a rollforward of the fair value of the Company’s redeemable noncontrolling interest:



	Six Months Ended
	June 27, 2015		June 28, 2014
	(in thousands)
Beginning balance	$	28,419	$	20,581
Additions	—		—
Total gains or losses (realized/unrealized):
Net income attributable to noncontrolling interest	364		372
Foreign currency translation	112		(462		)
Change in fair value, included in additional paid-in capital	1,081		2,992
Ending balance	$	29,976	$	23,483

Fair Value, Contingent Consideration

The following table provides a rollforward of the contingent consideration related to the acquisitions of Argenta, BioFocus, VivoPath and ChanTest. See Note 2, “Business Acquisitions.”



	Six Months Ended
	June 27, 2015			June 28, 2014
	(in thousands)
Beginning balance	$	2,828		$	—
Additions	675			2,428
Total gains or losses (realized/unrealized):
Reversal of previously recorded contingent liability and change in fair value	(672		)	(8		)
Ending balance	$	2,831		$	2,420

Goodwill and Other Intangible Assets (Tables)

6 Months Ended

Jun. 27, 2015

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Changes in the Gross Carrying Amount and Accumulated Amortization of Goodwill

The following table provides a rollforward of the Company’s goodwill:



			Adjustments to Goodwill
	December 27, 2014		Acquisitions			Foreign Exchange			June 27, 2015
	(in thousands)
Research Models and Services	$	59,196	$	—		$	(253	)	$	58,943
Discovery and Safety Assessment	229,302		(624		)	(1,533		)	227,145
Manufacturing Support	32,579		187			(1,440		)	31,326
Total	$	321,077	$	(437	)	$	(3,226	)	$	317,414

Schedule of Finite-Lived Intangible Assets

The following table displays other intangible assets, net by major class:



	June 27, 2015							December 27, 2014
	Gross		Accumulated Amortization			Net		Gross		Accumulated Amortization			Net
	(in thousands)
Backlog	$	8,903	$	(8,538	)	$	365	$	8,728	$	(6,636	)	$	2,092
Client relationships	375,465		(219,111		)	156,354		379,339		(217,938		)	161,401
Trademarks and trade names	6,599		(5,584		)	1,015		6,603		(5,314		)	1,289
Standard operating procedures	2,303		(1,844		)	459		2,309		(1,642		)	667
Other identifiable intangible assets	16,408		(5,663		)	10,745		16,334		(6,346		)	9,988
Total definite-lived intangible assets	409,678		(240,740		)	168,938		413,313		(237,876		)	175,437
Indefinite-lived intangibles assets						3,438							3,438
Total other intangibles assets, net						$	172,376						$	178,875

Long-Term Debt and Capital Lease Obligations (Tables)

6 Months Ended

Jun. 27, 2015

Debt Disclosure [Abstract]

Schedule of Debt

Long-term debt, net consists of the following:



	June 27, 2015			December 27, 2014
	(in thousands)
Term loans	$	400,000		$	378,000
Revolving credit facility	342,888			375,536
Other long-term debt	196			214
Total debt	743,084			753,750
Less: current portion of long-term debt	(15,196		)	(31,714		)
Long-term debt	727,888			722,036
Debt discount and debt issuance costs ⁽¹⁾	(7,670		)	(5,401		)
Long-term debt, net	$	720,218		$	716,635

Equity (Tables)

6 Months Ended

Jun. 27, 2015

Equity [Abstract]

Reconciliation of the Numerator and Denominator in the Computations of the Basic and Diluted Earnings Per Share

The following table reconciles the numerator and denominator in the computations of basic and diluted earnings per share:



	Three Months Ended						Six Months Ended
	June 27, 2015			June 28, 2014			June 27, 2015			June 28, 2014
	(in thousands)
Numerator:
Net income from continuing operations attributable to common shareholders	$	48,516		$	35,908		$	80,064		$	68,410
Loss from discontinued operations, net of income taxes	(7		)	(644		)	(14		)	(914		)
Net income attributable to common shareholders	$	48,509		$	35,264		$	80,050		$	67,496

Denominator:
Weighted-average shares outstanding—Basic	46,675			46,942			46,712			47,016
Effect of dilutive securities:
Stock options, restricted stock units, performance stock units and contingently issuable restricted stock	875			742			1,006			893
Weighted-average shares outstanding—Diluted	47,550			47,684			47,718			47,909

Schedule of Accumulated Other Comprehensive Income (Loss)

Changes to each component of accumulated other comprehensive income (loss), net of income tax, are as follows:



	Foreign Currency Translation and Other			Pension and Other Post-Retirement Benefit Plans			Total
	(in thousands)
December 27, 2014	$	(19,891	)	$	(54,356	)	$	(74,247	)
Other comprehensive loss before reclassifications	(14,785		)	—			(14,785		)
Amounts reclassified from accumulated other comprehensive income (loss)	(2,341		)	1,490			(851		)
Net current period other comprehensive income (loss)	(17,126		)	1,490			(15,636		)
Income tax expense	—			480			480
June 27, 2015	$	(37,017	)	$	(53,346	)	$	(90,363	)

The income tax expense (benefit) related to items of other comprehensive income are as follows:



	Three Months Ended				Six Months Ended
	June 27, 2015		June 28, 2014		June 27, 2015		June 28, 2014
	(in thousands)
Income tax benefit related to foreign currency translation adjustment	$	—	$	—	$	—	$	(105	)
Income tax expense related to change in unrecognized pension gains, losses and prior service costs	263		129		480		253
Income tax expense related to items of other comprehensive income	$	263	$	129	$	480	$	148

Income Taxes (Tables)

6 Months Ended

Jun. 27, 2015

Income Tax Disclosure [Abstract]

Schedule of Accumulated Other Comprehensive Income (Loss)

Changes to each component of accumulated other comprehensive income (loss), net of income tax, are as follows:



	Foreign Currency Translation and Other			Pension and Other Post-Retirement Benefit Plans			Total
	(in thousands)
December 27, 2014	$	(19,891	)	$	(54,356	)	$	(74,247	)
Other comprehensive loss before reclassifications	(14,785		)	—			(14,785		)
Amounts reclassified from accumulated other comprehensive income (loss)	(2,341		)	1,490			(851		)
Net current period other comprehensive income (loss)	(17,126		)	1,490			(15,636		)
Income tax expense	—			480			480
June 27, 2015	$	(37,017	)	$	(53,346	)	$	(90,363	)

The income tax expense (benefit) related to items of other comprehensive income are as follows:



	Three Months Ended				Six Months Ended
	June 27, 2015		June 28, 2014		June 27, 2015		June 28, 2014
	(in thousands)
Income tax benefit related to foreign currency translation adjustment	$	—	$	—	$	—	$	(105	)
Income tax expense related to change in unrecognized pension gains, losses and prior service costs	263		129		480		253
Income tax expense related to items of other comprehensive income	$	263	$	129	$	480	$	148

Pension and Other Post-Retirement Benefit Plans Employee Benefits (Tables)

6 Months Ended

Jun. 27, 2015

Compensation and Retirement Disclosure [Abstract]

Schedule of Net Benefit Costs



	Pension Plans						Other Post-Retirement Benefit Plans
	June 27, 2015			June 28, 2014			June 27, 2015		June 28, 2014
	(in thousands)
Service cost	$	936		$	843		$	214	$	190
Interest cost	3,070			3,211			266		253
Expected return on plan assets	(4,382		)	(4,277		)	—		—
Amortization of prior service cost (credit)	(150		)	(159		)	—		165
Amortization of net loss	841			223			70		62
Net periodic cost (benefit)	$	315		$	(159	)	$	550	$	670



	Pension Plans						Other Post-Retirement Benefit Plans
	June 27, 2015			June 28, 2014			June 27, 2015		June 28, 2014
	(in thousands)
Service cost	$	1,871		$	1,685		428		$	379
Interest cost	6,140			6,422			531		505
Expected return on plan assets	(8,764		)	(8,555		)	—		—
Amortization of prior service cost (credit)	(301		)	(318		)	—		330
Amortization of net loss	1,653			446			138		125
Net periodic cost (benefit)	$	599		$	(320	)	$	1,097	$	1,339

Stock-Based Compensation (Tables)

6 Months Ended

Jun. 27, 2015

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of Stock-Based Compensation Expense

The following table provides stock-based compensation by the financial statement line item in which it is reflected:



	Three Months Ended						Six Months Ended
	June 27, 2015			June 28, 2014			June 27, 2015			June 28, 2014
	(in thousands)
Cost of revenue	$	1,788		$	1,318		$	3,289		$	2,671
Selling, general and administrative	8,411			6,904			16,584			12,210
Stock-based compensation, before income taxes	10,199			8,222			19,873			14,881
Provision for income taxes	(3,619		)	(2,964		)	(7,004		)	(5,328		)
Stock-based compensation, net of income tax	$	6,580		$	5,258		$	12,869		$	9,553

Segment Information (Tables)

6 Months Ended

Jun. 27, 2015

Segment Reporting [Abstract]

Schedule of Sales and Other Financial Information by Business Segment

The following table presents revenue and other financial information by reportable segment:



	Three Months Ended				Six Months Ended
	June 27, 2015		June 28, 2014		June 27, 2015		June 28, 2014
	(in thousands)
Research Models and Services
Revenue	$	120,044	$	133,120	$	240,055	$	265,615
Gross margin	49,707		52,450		95,511		104,097
Operating income	33,461		34,234		62,306		69,678
Depreciation and amortization	5,348		6,559		11,393		13,000
Capital expenditures	6,356		3,319		9,089		7,418
Discovery and Safety Assessment
Revenue	$	153,375	$	142,614	$	293,387	$	247,752
Gross margin	49,256		39,457		92,939		65,116
Operating income	28,149		17,798		51,665		29,511
Depreciation and amortization	12,412		12,385		23,551		20,527
Capital expenditures	4,101		3,858		9,479		7,894
Manufacturing Support
Revenue	$	66,154	$	65,445	$	126,545	$	127,180
Gross margin	33,820		33,727		63,993		65,234
Operating income	20,431		20,455		37,229		38,871
Depreciation and amortization	3,609		3,484		6,895		7,112
Capital expenditures	1,770		1,717		3,336		3,981

Reconciliation of Segment Operating Income to Consolidated Operating Income

For the three months ended June 27, 2015, reconciliations of segment operating income, depreciation and amortization, and capital expenditures to the respective consolidated amounts are as follows:



	Operating Income						Depreciation and Amortization				Capital Expenditures
	June 27, 2015			June 28, 2014			June 27, 2015		June 28, 2014		June 27, 2015		June 28, 2014
	(in thousands)
Total reportable segments	$	82,041		$	72,487		$	21,369	$	22,428	$	12,227	$	8,894
Unallocated corporate	(26,306		)	(21,462		)	1,779		1,874		1,681		421
Total consolidated	$	55,735		$	51,025		$	23,148	$	24,302	$	13,908	$	9,315

For the six months ended June 27, 2015, reconciliations of segment operating income, depreciation and amortization, and capital expenditures to the respective consolidated amounts are as follows:



	Operating Income						Depreciation and Amortization				Capital Expenditures
	June 27, 2015			June 28, 2014			June 27, 2015		June 28, 2014		June 27, 2015		June 28, 2014
	(in thousands)
Total reportable segments	$	151,200		$	138,060		$	41,839	$	40,639	$	21,904	$	19,293
Unallocated corporate	(52,460		)	(47,329		)	3,677		3,713		2,652		1,212
Total consolidated	$	98,740		$	90,731		$	45,516	$	44,352	$	24,556	$	20,505

Schedule of Net Sales for Each Significant Service Area

Revenue for each significant product or service area is as follows:



	Three Months Ended				Six Months Ended
	June 27, 2015		June 28, 2014		June 27, 2015		June 28, 2014
	(in thousands)
Research models and services	$	120,044	$	133,120	$	240,055	$	265,615
Discovery and safety assessment	153,375		142,614		293,387		247,752
Endotoxin and Microbial Detection	33,653		33,579		66,479		66,045
Other manufacturing support	32,501		31,866		60,066		61,135
Manufacturing support	66,154		65,445		126,545		127,180
Total revenue	$	339,573	$	341,179	$	659,987	$	640,547

Summary of Unallocated Corporate Overhead

A summary of unallocated corporate overhead consists of the following:



	Three Months Ended				Six Months Ended
	June 27, 2015		June 28, 2014		June 27, 2015		June 28, 2014
	(in thousands)
Stock-based compensation expense	$	6,419	$	4,905	$	12,699	$	8,607
Salary, bonus and fringe	7,234		7,438		17,930		17,705
Consulting, audit and professional services	3,130		2,437		6,771		5,668
IT related expenses	1,685		1,323		3,549		2,900
Depreciation expense	1,779		1,874		3,677		3,713
Acquisition related adjustments	3,956		1,371		3,594		4,676
Other general unallocated corporate expenses	2,103		2,114		4,240		4,060
Total unallocated corporate overhead costs	$	26,306	$	21,462	$	52,460	$	47,329

Basis of Presentation Basis of Presentation (Details) - USD ($) $ in Thousands	Jun. 27, 2015	Dec. 27, 2014
New Accounting Pronouncement, Early Adoption [Line Items]
Long-term debt	$ (727,888)	$ (722,036)
Early Adoption
New Accounting Pronouncement, Early Adoption [Line Items]
Long-term debt	(7,700)	(5,400)
Other assets	$ 7,700	$ 5,400

Business Acquisitions - Sunrise, Additional Information (Details) - USD ($) $ in Thousands		3 Months Ended	6 Months Ended
	May 05, 2015	Jun. 27, 2015	Jun. 27, 2015	Jun. 28, 2014
Business Acquisition [Line Items]
Gain on bargain purchase			$ (9,878)	$ 0
Sunrise
Business Acquisition [Line Items]
Preliminary purchase price	$ 9,558
Gain on bargain purchase	(9,878)
Cash acquired	$ 100
Price allocation adjustment period, maximum	1 year
Transaction and integration costs		$ 300	$ 600
Client relationships \| Sunrise
Business Acquisition [Line Items]
Useful life of intangible assets acquired			15 years

Business Acquisitions Business Acquisitions - Sunrise Purchase Price Allocation (Details) - USD ($) $ in Thousands		6 Months Ended
	May 05, 2015	Jun. 27, 2015	Jun. 28, 2014
Business Acquisition [Line Items]
Bargain purchase gain		$ (9,878)	$ 0
Sunrise
Business Acquisition [Line Items]
Accounts receivable, net	$ 981
Inventory	1,518
Other current assets (excluding cash)	318
Property, plant and equipment	13,866
Definite-lived intangible assets	3,400
Current liabilities	(397)
Long-term liabilities	(250)
Fair value of net assets acquired	19,436
Bargain purchase gain	(9,878)
Total purchase price allocation	$ 9,558

Business Acquisitions - ChanTest, Additional Information (Details) - USD ($)		6 Months Ended
	Oct. 29, 2014	Jun. 27, 2015	Jun. 28, 2014
Business Acquisition [Line Items]
Total purchase price allocation		$ 10,680,000	$ 183,151,000
ChanTest
Business Acquisition [Line Items]
Preliminary purchase price	$ 59,300,000
Contingent consideration	300,000
Maximum contingent consideration limit	2,000,000
Total purchase price allocation	52,073,000
Total purchase price allocation	$ 7,200,000
Price allocation adjustment period, maximum	1 year

Business Acquisitions - Chan Test Preliminary Purchase Price (Details) - USD ($) $ in Thousands		6 Months Ended
	Oct. 29, 2014	Jun. 27, 2015	Jun. 28, 2014	Dec. 27, 2014
Business Acquisition [Line Items]
Goodwill		$ 317,414		$ 321,077
Total purchase price allocation		$ 10,680	$ 183,151
ChanTest
Business Acquisition [Line Items]
Current assets (excluding cash)	$ 4,648
Property, plant and equipment	1,579
Definite-lived intangible assets	23,920
Goodwill	34,927
Current liabilities	(3,515)
Long-term liabilities	(9,486)
Total purchase price allocation	$ 52,073

Business Acquisitions - ChanTest Breakout of Definite-Lived Intangible Assets Acquired (Details) - ChanTest $ in Thousands	Oct. 29, 2014 USD ($)
Acquired Finite-Lived Intangible Assets [Line Items]
Total definite-lived intangible assets	$ 23,920
Client relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets acquired	$ 19,000
Weighted average amortization life	13 years
Other intangible assets
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets acquired	$ 4,920
Weighted average amortization life	9 years

Business Acquisitions - VivoPath (Details)	1 Months Ended
Business Acquisitions - VivoPath (Details)	Jun. 30, 2014 USD ($)
Business Acquisition [Line Items]
Contingent consideration	$ 600,000
VivoPath
Business Acquisition [Line Items]
Acquisition purchase price	2,300,000
Contingent consideration	1,600,000
Aggregate undiscounted amount of contingent consideration	$ 2,400,000
Earn-out period	3 years

Business Acquisitions - Early Discovery, Additional Information (Details) € in Millions		3 Months Ended			6 Months Ended
	Apr. 01, 2014 USD ($)	Jun. 27, 2015 USD ($)	Mar. 28, 2015 USD ($)	Jun. 28, 2014 USD ($)	Jun. 27, 2015 USD ($)	Jun. 28, 2014 USD ($)	Jun. 27, 2015 EUR (€)	Jun. 27, 2015 USD ($)
Business Acquisition [Line Items]
Gain from contingent liability earn-out period			$ 800,000
Revenue		$ 20,100,000		$ 23,500,000	$ 40,700,000
Operating loss				1,700,000	1,400,000	$ 100,000
Pro forma adjustments, acquisitions	$ 3,700,000
Early Discovery UK
Business Acquisition [Line Items]
Percentage of voting interests acquired	100.00%
Acquisition purchase price	$ 191,800,000
Contingent consideration	900,000
Aggregate undiscounted amount of contingent consideration							€ 5.0	$ 5,600,000
Purchase price allocation, net of cash	183,594,000
Purchase price allocation, cash	$ 8,200,000
Acquisition related adjustments (less than $0.1 million in 2015)		$ 87,000		$ 1,600,000	$ 87,000	$ 4,900,000

Business Acquisitions - Early Discovery Purchase Price Allocation (Details) - USD ($) $ in Thousands	Jun. 27, 2015	Dec. 27, 2014	Apr. 01, 2014
Business Acquisition [Line Items]
Goodwill	$ 317,414	$ 321,077
Early Discovery UK
Business Acquisition [Line Items]
Current assets (excluding cash)			$ 31,682
Property, plant and equipment			21,008
Other long term assets			11,140
Definite-lived intangible assets			104,470
Goodwill			65,235
Current liabilities			(13,139)
Long term liabilities			(36,802)
Total purchase price allocation			$ 183,594

Business Acquisitions - Early Discovery Breakout of Definite-Lived Intangible Assets Acquired (Details) - Early Discovery UK - USD ($) $ in Thousands	Apr. 01, 2015	Apr. 01, 2014
Definite-Lived Intangible Assets
Client relationships		$ 94,000
Backlog		5,900
Trademark and trade names		1,170
Leasehold interests		1,000
Other intangible assets		2,400
Total definite-lived intangible assets		$ 104,470
Client relationships
Definite-Lived Intangible Assets
Weighted average amortization life	18 years
Backlog
Definite-Lived Intangible Assets
Weighted average amortization life	1 year
Trademark and trade names
Definite-Lived Intangible Assets
Weighted average amortization life	3 years
Leasehold interests
Definite-Lived Intangible Assets
Weighted average amortization life	13 years
Other intangible assets
Definite-Lived Intangible Assets
Weighted average amortization life	19 years

Business Acquisitions Business Acquisitions - Early Discovery Pro Forma Information (Details) - Early Discovery UK - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 27, 2015	Jun. 28, 2014	Jun. 27, 2015	Jun. 28, 2014
Business Acquisition [Line Items]
Revenue	$ 339,573	$ 341,179	$ 659,987	$ 665,656
Net income attributable to common shareholders	$ 48,509	$ 35,264	$ 80,050	$ 65,688
Earnings per common share
Basic (in dollars per share)	$ 1.04	$ 0.75	$ 1.71	$ 1.40
Diluted (in dollars per share)	$ 1.02	$ 0.74	$ 1.68	$ 1.38

Restructuring - Severance and Retention Cost Liability (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 27, 2015	Jun. 28, 2014	Jun. 27, 2015	Jun. 28, 2014	Dec. 27, 2014
Restructuring Reserve [Roll Forward]
Balance, beginning of period			$ 2,666
Total expense	$ 705	$ 2,889	1,835	$ 4,789
Expense			1,835
Payments and Adjustments			(2,765)
Balance, end of period	1,736		1,736
Accrued Compensation
Restructuring Cost and Reserve [Line Items]
Severance and retention costs, current	1,400		1,400		$ 2,200
Other Long-Term Liabilities
Restructuring Cost and Reserve [Line Items]
Severance and retention costs, noncurrent	$ 300		$ 300		$ 500

Restructuring - Severance and Retention Costs by Classification on the Income Statement (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 27, 2015	Jun. 28, 2014	Jun. 27, 2015	Jun. 28, 2014
Restructuring Cost and Reserve [Line Items]
Total expense	$ 705	$ 2,889	$ 1,835	$ 4,789
Severance charges included in cost of revenue
Restructuring Cost and Reserve [Line Items]
Total expense	137	1,072	667	2,754
Severance charges included in selling, general and administrative
Restructuring Cost and Reserve [Line Items]
Total expense	$ 568	$ 1,817	$ 1,168	$ 2,035

Restructuring - Severance and Retention Cost by Reportable Segment (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 27, 2015	Jun. 28, 2014	Jun. 27, 2015	Jun. 28, 2014
Restructuring Cost and Reserve [Line Items]
Severance charges	$ 705	$ 2,889	$ 1,835	$ 4,789
Research Models and Services
Restructuring Cost and Reserve [Line Items]
Severance charges	80	2,011	999	3,595
Discovery and Safety Assessment
Restructuring Cost and Reserve [Line Items]
Severance charges	456	854	475	1,049
Manufacturing Support
Restructuring Cost and Reserve [Line Items]
Severance charges	118	24	295	24
Corporate
Restructuring Cost and Reserve [Line Items]
Severance charges	$ 51	$ 0	$ 66	$ 121

Supplemental Balance Sheet Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 27, 2015	Jun. 28, 2014	Jun. 27, 2015	Jun. 28, 2014	Dec. 27, 2014
Composition of trade receivables
Client receivables	$ 233,569		$ 233,569		$ 219,118
Unbilled revenue	49,016		49,016		43,780
Total	282,585		282,585		262,898
Less: Allowance for doubtful accounts	(5,187)		(5,187)		(4,907)
Trade receivables, net	277,398		277,398		257,991
Composition of inventories
Raw materials and supplies	13,885		13,885		15,416
Work in process	12,023		12,023		11,802
Finished products	64,129		64,129		61,825
Inventories	90,037		90,037		89,043
Composition of other current assets
Deferred tax asset	23,058		23,058		27,644
Investments	18,074		18,074		16,167
Prepaid income tax	31,537		31,537		26,287
Restricted cash	100		100		2,552
Other	1,684		1,684		291
Other current assets	74,453		74,453		72,941
Property, Plant and Equipment [Line Items]
Total	1,341,797		1,341,797		1,331,780
Less: Accumulated depreciation	(661,232)		(661,232)		(654,983)
Property, plant and equipment, net	680,565		680,565		676,797
Depreciation expense	17,400	$ 17,400	34,500	$ 33,200
Composition of other assets
Life insurance policies	28,237		28,237		27,603
Investments in limited partnerships	29,141		29,141		27,047
Other	5,838		5,838		18,301
Other assets	63,216		63,216		72,951
Composition of other current liabilities
Accrued income taxes	10,906		10,906		9,362
Current deferred tax liability	1,302		1,302		1,484
Accrued interest and other	356		356		233
Other current liabilities	12,564		12,564		11,079
Composition of other long-term liabilities
Deferred tax liability	25,550		25,550		30,816
Long-term pension liability	40,531		40,531		45,135
Accrued executive supplemental life insurance retirement plan and deferred compensation plan	33,424		33,424		33,007
Other long-term liabilities	11,751		11,751		21,403
Other long-term liabilities	111,256		111,256		130,361
Land
Property, Plant and Equipment [Line Items]
Total	42,796		42,796		40,314
Buildings
Property, Plant and Equipment [Line Items]
Total	711,943		711,943		682,495
Machinery and equipment
Property, Plant and Equipment [Line Items]
Total	380,871		380,871		384,713
Leasehold improvements
Property, Plant and Equipment [Line Items]
Total	36,955		36,955		37,270
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Total	21,237		21,237		22,577
Vehicles
Property, Plant and Equipment [Line Items]
Total	4,101		4,101		3,967
Computer hardware and software
Property, Plant and Equipment [Line Items]
Total	122,050		122,050		119,474
Construction in progress
Property, Plant and Equipment [Line Items]
Total	$ 21,844		$ 21,844		$ 40,970

Investments in Limited Partnerships and Marketable Securities - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 27, 2015	Jun. 28, 2014	Jun. 27, 2015	Jun. 28, 2014
Schedule of Equity Method Investments [Line Items]
Committed contribution	$ 65,000		$ 65,000
Committed contributions funded	23,500		23,500
Dividends in cash and securities received	2,100	$ 900	2,100	$ 7,400
Income (loss) from investments in limited partnerships	$ (907)	$ 2,076	$ 364	$ 8,180
Minimum
Schedule of Equity Method Investments [Line Items]
Ownership percentage	3.80%		3.80%
Maximum
Schedule of Equity Method Investments [Line Items]
Ownership percentage	12.00%		12.00%

Investments in Limited Partnerships and Marketable Securities - Summary of Marketable Securities (Details) $ in Thousands	Jun. 27, 2015 USD ($)
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 4,650
Gross Unrealized Gains	0
Gross Unrealized Losses	(89)
Fair Value	4,561
Mutual fund
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	4,650
Gross Unrealized Gains	0
Gross Unrealized Losses	(89)
Fair Value	$ 4,561

Fair Value - Fair Value of Assets and Liabilities (Details) - USD ($) $ in Thousands	Jun. 27, 2015	Dec. 27, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	$ 129	$ 1,934
Marketable securities	4,561
Life insurance policies	21,152	20,520
Total assets measured at fair value	25,842	22,454
Redeemable noncontrolling interest	29,976	28,419
Contingent consideration	2,831	2,828
Total liabilities measured at fair value	32,807	31,247
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	0	0
Marketable securities	4,561
Life insurance policies	0	0
Total assets measured at fair value	4,561	0
Redeemable noncontrolling interest	0	0
Contingent consideration	0	0
Total liabilities measured at fair value	0	0
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	129	1,934
Marketable securities	0
Life insurance policies	21,152	20,520
Total assets measured at fair value	21,281	22,454
Redeemable noncontrolling interest	0	0
Contingent consideration	0	0
Total liabilities measured at fair value	0	0
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	0	0
Marketable securities	0
Life insurance policies	0	0
Total assets measured at fair value	0	0
Redeemable noncontrolling interest	29,976	28,419
Contingent consideration	2,831	2,828
Total liabilities measured at fair value	$ 32,807	$ 31,247

Fair Value - Redeemable Noncontrolling Interest (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 27, 2015	Jun. 28, 2014
Fair Value Disclosures [Abstract]
Percentage of voting interests acquired	75.00%
Remaining ownership percentage available	25.00%
Total gains or losses (realized/unrealized):
Discount rate	19.00%
Level 3 \| Redeemable Noncontrolling Interest
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ 28,419	$ 20,581
Additions	0	0
Total gains or losses (realized/unrealized):
Net income attributable to noncontrolling interest	364	372
Foreign currency translation	112	(462)
Change in fair value, included in additional paid-in capital	1,081	2,992
Ending balance	$ 29,976	$ 23,483

Fair Value - Contingent Consideration (Details) - Contingent Consideration - USD ($) $ in Thousands	6 Months Ended
	Jun. 27, 2015	Jun. 28, 2014
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ 2,828	$ 0
Additions	675	2,428
Total gains or losses (realized/unrealized):
Reversal of previously recorded contingent liability and change in fair value	(672)	(8)
Ending balance	$ 2,831	$ 2,420

Goodwill and Other Intangible Assets - Gross Carrying Amount and Accumulated Amortization of Goodwill (Details) $ in Thousands	6 Months Ended
	Jun. 27, 2015 USD ($)
Changes in gross carrying amount and accumulated amortization of goodwill
Gross carrying amount, balance at the beginning of the period	$ 321,077
Adjustments to Goodwill, Acquisitions	(437)
Adjustments to Goodwill, Foreign Exchange	(3,226)
Gross carrying amount, balance at the end of the period	317,414
Research Models and Services
Changes in gross carrying amount and accumulated amortization of goodwill
Gross carrying amount, balance at the beginning of the period	59,196
Adjustments to Goodwill, Acquisitions	0
Adjustments to Goodwill, Foreign Exchange	(253)
Gross carrying amount, balance at the end of the period	58,943
Discovery and Safety Assessment
Changes in gross carrying amount and accumulated amortization of goodwill
Gross carrying amount, balance at the beginning of the period	229,302
Adjustments to Goodwill, Acquisitions	(624)
Adjustments to Goodwill, Foreign Exchange	(1,533)
Gross carrying amount, balance at the end of the period	227,145
Manufacturing Support
Changes in gross carrying amount and accumulated amortization of goodwill
Gross carrying amount, balance at the beginning of the period	32,579
Adjustments to Goodwill, Acquisitions	187
Adjustments to Goodwill, Foreign Exchange	(1,440)
Gross carrying amount, balance at the end of the period	$ 31,326

Goodwill and Other Intangible Assets - Schedule of Other Intangible Assets (Details) - USD ($) $ in Thousands	Jun. 27, 2015	Dec. 27, 2014
Other intangible assets
Gross	$ 409,678	$ 413,313
Accumulated Amortization	(240,740)	(237,876)
Net	168,938	175,437
Indefinite-lived intangibles assets	3,438	3,438
Total other intangibles assets, net	172,376	178,875
Backlog
Other intangible assets
Gross	8,903	8,728
Accumulated Amortization	(8,538)	(6,636)
Net	365	2,092
Client relationships
Other intangible assets
Gross	375,465	379,339
Accumulated Amortization	(219,111)	(217,938)
Net	156,354	161,401
Trademarks and trade names
Other intangible assets
Gross	6,599	6,603
Accumulated Amortization	(5,584)	(5,314)
Net	1,015	1,289
Standard operating procedures
Other intangible assets
Gross	2,303	2,309
Accumulated Amortization	(1,844)	(1,642)
Net	459	667
Other identifiable intangible assets
Other intangible assets
Gross	16,408	16,334
Accumulated Amortization	(5,663)	(6,346)
Net	$ 10,745	$ 9,988

Long-Term Debt and Capital Lease Obligations - Schedule of Long-Term Debt (Details) - USD ($) $ in Thousands	Jun. 27, 2015	Dec. 27, 2014
Debt Instrument [Line Items]
Total debt	$ 743,084	$ 753,750
Less: current portion of long-term debt	(15,196)	(31,714)
Long-term debt	727,888	722,036
Debt discount and debt issuance costs	(7,670)	(5,401)
Long-term debt, net	720,218	716,635
Term loan facilities
Debt Instrument [Line Items]
Total debt	400,000	378,000
Revolving credit facility
Debt Instrument [Line Items]
Total debt	342,888	375,536
Other long-term debt
Debt Instrument [Line Items]
Total debt	$ 196	$ 214

Long-Term Debt and Capital Lease Obligations - Additional Information (Details)	6 Months Ended
	Jun. 27, 2015 USD ($)	May 01, 2015 USD ($)	Apr. 30, 2015 USD ($) payment	Mar. 28, 2015 USD ($)	Dec. 27, 2014 USD ($)
Debt Instrument [Line Items]
Maximum borrowing capacity, Term Loan and Line of Credit		$ 1,300,000,000.0	$ 1,300,000,000.0	$ 970,000,000
Term loan facility			400,000,000.0
Multi-currency revolving credit facility			$ 900,000,000.0
Number of quarterly installment payments \| payment			20
Interest rate	0.50%
Weighted average interest rate	1.31%				1.42%
Letters of credit outstanding	$ 4,900,000				$ 5,000,000
Financing Obligation \| Early Discovery UK
Debt Instrument [Line Items]
Other capital lease obligations	35,800,000
Other Capital Lease Obligations
Debt Instrument [Line Items]
Other capital lease obligations	$ 37,400,000				$ 1,000,000

Equity - Earnings Per Share (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 27, 2015	Jun. 28, 2014	Jun. 27, 2015	Jun. 28, 2014
Numerator:
Net income from continuing operations attributable to common shareholders	$ 48,516	$ 35,908	$ 80,064	$ 68,410
Loss from discontinued operations, net of income taxes	(7)	(644)	(14)	(914)
Net income attributable to common shareholders	$ 48,509	$ 35,264	$ 80,050	$ 67,496
Denominator:
Weighted-average shares outstanding—Basic (in shares)	46,675	46,942	46,712	47,016
Effect of dilutive securities:
Stock options, restricted stock units, performance stock units and contingently issuable restricted stock (in shares)	875	742	1,006	893
Weighted-average shares outstanding—Diluted (in shares)	47,550	47,684	47,718	47,909

- Definition

Amount after tax of income (loss) from a discontinued operation including the portion attributable to the noncontrolling interest. Includes, but is not limited to, the income (loss) from operations during the phase-out period, gain (loss) on disposal, gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and adjustments to a prior period gain (loss) on disposal.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04.12)
-URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 5C
-Subparagraph (b)(2)
-URI http://asc.fasb.org/extlink&oid=51717284&loc=SL51721675-107760

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.14)
-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 45
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=51716988&loc=d3e1012-107759

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 45
-Paragraph 3B
-URI http://asc.fasb.org/extlink&oid=51716988&loc=SL51721525-107759

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 45
-Paragraph 3A
-URI http://asc.fasb.org/extlink&oid=51716988&loc=SL51721523-107759

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=51716988&loc=d3e957-107759

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=51717284&loc=d3e1361-107760

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Paragraph 13
-Article 7

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 03
-Paragraph 15
-Article 5

+ Details

Equity - Earnings Per Share, Additional Information (Details) - shares shares in Millions	3 Months Ended		6 Months Ended
	Jun. 27, 2015	Jun. 28, 2014	Jun. 27, 2015	Jun. 28, 2014
Employee Stock Option
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share amount (in shares)			0.5	0.9
Restricted Stock and Restricted Stock Units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share amount (in shares)	1.1	1.2	1.1	1.2

Equity - Treasury Shares (Details) - USD ($) shares in Millions	6 Months Ended		12 Months Ended
	Jun. 27, 2015	Jun. 28, 2014	Dec. 27, 2014	Dec. 28, 2013	Dec. 25, 2010	Jul. 31, 2010
Treasury Shares
Purchase of treasury stock	$ 99,486,000	$ 101,609,000
2010 Share Repurchase Program
Treasury Shares
Authorized stock repurchase amount	$ 1,150,000,000					$ 500,000,000
Stock repurchased during period (in shares)	1.2	1.7
Purchase of treasury stock	$ 90,800,000	$ 90,300,000
Authorized increase, stock repurchase			$ 150,000,000	$ 250,000,000	$ 250,000,000
Remaining authorized repurchase amount	$ 87,600,000
2007 Incentive Plan
Treasury Shares
Number of shares of common stock repurchased (in shares)	0.1	0.1
Open market repurchases
Treasury Shares
Purchase of treasury stock	$ 8,700,000	$ 6,700,000

Equity - Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 27, 2015	Jun. 28, 2014	Jun. 27, 2015	Jun. 28, 2014
Accumulated Other Comprehensive Income (Loss), before Tax [Roll Forward]
December 27, 2014			$ (74,247)
Other comprehensive loss before reclassifications			(14,785)
Amounts reclassified from accumulated other comprehensive income (loss)			(851)
Net current period other comprehensive income (loss)			(15,636)
Income tax expense	$ 263	$ 129	480	$ 148
June 27, 2015	(90,363)		(90,363)
Foreign Currency Translation and Other
Accumulated Other Comprehensive Income (Loss), before Tax [Roll Forward]
December 27, 2014			(19,891)
Other comprehensive loss before reclassifications			(14,785)
Amounts reclassified from accumulated other comprehensive income (loss)			(2,341)
Net current period other comprehensive income (loss)			(17,126)
Income tax expense			0
June 27, 2015	(37,017)		(37,017)
Pension and Other Post-Retirement Benefit Plans
Accumulated Other Comprehensive Income (Loss), before Tax [Roll Forward]
December 27, 2014			(54,356)
Other comprehensive loss before reclassifications			0
Amounts reclassified from accumulated other comprehensive income (loss)			1,490
Net current period other comprehensive income (loss)			1,490
Income tax expense			480
June 27, 2015	$ (53,346)		$ (53,346)

- Definition

Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

+ References + Details

Income Taxes (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended		12 Months Ended
Income Taxes (Details) - USD ($) $ in Thousands	May 05, 2015	Jun. 27, 2015	Jun. 28, 2014	Jun. 27, 2015	Jun. 28, 2014	Dec. 28, 2013
Income Tax Disclosure [Abstract]
Effective tax rate (as a percentage)		18.40%	27.90%	12.40%	26.10%
Reduction in unrecognized tax benefits and related interest		$ 1,800
Business Acquisition [Line Items]
Gain on bargain purchase				$ (9,878)	$ 0
Income Tax Uncertainties [Abstract]
Decrease in unrecognized tax benefits		(100)				$ (1,400)
Unrecognized tax benefits		23,000		23,000
Unrecognized tax benefits that would impact effective tax rate favorably, if recognized		20,100		20,100
Decrease resulting from acquisition				10,400
Decrease resulting from foreign currency translation		1,800
Unrecognized income tax benefits that would impact rate		400
Accrued interest on unrecognized tax benefits		1,000		1,000
Possible decrease of unrecognized tax benefits		$ 200		$ 200
Sunrise
Business Acquisition [Line Items]
Gain on bargain purchase	$ (9,878)

Income Taxes - Income Tax Expense (Benefit) Related to Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 27, 2015	Jun. 28, 2014	Jun. 27, 2015	Jun. 28, 2014
Income Tax Disclosure [Abstract]
Income tax benefit related to foreign currency translation adjustment	$ 0	$ 0	$ 0	$ (105)
Income tax expense related to change in unrecognized pension gains, losses and prior service costs	263	129	480	253
Income tax expense related to items of other comprehensive income	$ 263	$ 129	$ 480	$ 148

Pension and Other Post-Retirement Benefit Plans (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 27, 2015	Jun. 28, 2014	Jun. 27, 2015	Jun. 28, 2014
Pension Plans
Employee benefits
Service cost	$ 936	$ 843	$ 1,871	$ 1,685
Interest cost	3,070	3,211	6,140	6,422
Expected return on plan assets	(4,382)	(4,277)	(8,764)	(8,555)
Amortization of prior service cost (credit)	(150)	(159)	(301)	(318)
Amortization of net loss	841	223	1,653	446
Net periodic cost (benefit)	315	(159)	599	(320)
Other Post-Retirement Benefit Plans
Employee benefits
Service cost	214	190	428	379
Interest cost	266	253	531	505
Expected return on plan assets	0	0	0	0
Amortization of prior service cost (credit)	0	165	0	330
Amortization of net loss	70	62	138	125
Net periodic cost (benefit)	$ 550	$ 670	$ 1,097	$ 1,339

Stock-Based Compensation - Stock Based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 27, 2015	Jun. 28, 2014	Jun. 27, 2015	Jun. 28, 2014
Stock-based compensation expense
Stock-based compensation, before income taxes	$ 10,199	$ 8,222	$ 19,873	$ 14,881
Provision for income taxes	(3,619)	(2,964)	(7,004)	(5,328)
Stock-based compensation, net of income tax	6,580	5,258	12,869	9,553
Cost of revenue
Stock-based compensation expense
Stock-based compensation, before income taxes	1,788	1,318	3,289	2,671
Selling, general and administrative
Stock-based compensation expense
Stock-based compensation, before income taxes	$ 8,411	$ 6,904	$ 16,584	$ 12,210

Stock-Based Compensation - Summary of Stock-Based Compensation Grants (Details) $ / shares in Units, $ in Millions	6 Months Ended
	Jun. 27, 2015 USD ($) $ / shares shares
Stock Issued or Granted During Period, Share-based Compensation [Abstract]
Increase in stock-based compensation expense \| $	$ 2.6
Stock Options
Stock Issued or Granted During Period, Share-based Compensation [Abstract]
Stock options granted (in shares)	500,000
Stock options weighted average grant date fair value (in dollars per share) \| $ / shares	$ 17.27
Restricted Stock
Stock Issued or Granted During Period, Share-based Compensation [Abstract]
Shares granted (in shares)	100,000
Weighted-average grant date fair value (in dollars per share) \| $ / shares	$ 70.29
Restricted Stock Units
Stock Issued or Granted During Period, Share-based Compensation [Abstract]
Shares granted (in shares)	200,000
Weighted-average grant date fair value (in dollars per share) \| $ / shares	$ 76.67
Performance Stock Units
Stock Issued or Granted During Period, Share-based Compensation [Abstract]
Shares granted (in shares)	200,000
Weighted-average grant date fair value (in dollars per share) \| $ / shares	$ 87.50
Maximum shares to be awarded under plan	300,000

Commitments and Contingencies (Details) $ in Millions	6 Months Ended
Commitments and Contingencies (Details) $ in Millions	Jun. 27, 2015 USD ($)
Loss Contingencies [Line Items]
Increase in lease obligations	$ 10.1
Government billing
Loss Contingencies [Line Items]
Reserve for estimated possible loss	$ 1.5

Segment Information - Revenue and Other Financial Information by Reportable Segment (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 27, 2015	Jun. 28, 2014	Jun. 27, 2015	Jun. 28, 2014
Segment Reporting Information [Line Items]
Revenue	$ 339,573	$ 341,179	$ 659,987	$ 640,547
Operating income	55,735	51,025	98,740	90,731
Depreciation and amortization	23,148	24,302	45,516	44,352
Capital expenditures	13,908	9,315	24,556	20,505
Research Models and Services
Segment Reporting Information [Line Items]
Revenue	120,044	133,120	240,055	265,615
Gross margin	49,707	52,450	95,511	104,097
Operating income	33,461	34,234	62,306	69,678
Depreciation and amortization	5,348	6,559	11,393	13,000
Capital expenditures	6,356	3,319	9,089	7,418
Discovery and Safety Assessment
Segment Reporting Information [Line Items]
Revenue	153,375	142,614	293,387	247,752
Gross margin	49,256	39,457	92,939	65,116
Operating income	28,149	17,798	51,665	29,511
Depreciation and amortization	12,412	12,385	23,551	20,527
Capital expenditures	4,101	3,858	9,479	7,894
Manufacturing Support
Segment Reporting Information [Line Items]
Revenue	66,154	65,445	126,545	127,180
Gross margin	33,820	33,727	63,993	65,234
Operating income	20,431	20,455	37,229	38,871
Depreciation and amortization	3,609	3,484	6,895	7,112
Capital expenditures	$ 1,770	$ 1,717	$ 3,336	$ 3,981

Segment Information - Reconciliation of Segment Operating Income, Depreciation and Amortization, and Capital Expenditures (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 27, 2015	Jun. 28, 2014	Jun. 27, 2015	Jun. 28, 2014
Segment Reporting Information [Line Items]
Operating income	$ 55,735	$ 51,025	$ 98,740	$ 90,731
Depreciation and amortization	23,148	24,302	45,516	44,352
Capital expenditures	13,908	9,315	24,556	20,505
Total reportable segments
Segment Reporting Information [Line Items]
Operating income	82,041	72,487	151,200	138,060
Depreciation and amortization	21,369	22,428	41,839	40,639
Capital expenditures	12,227	8,894	21,904	19,293
Unallocated corporate
Segment Reporting Information [Line Items]
Operating income	(26,306)	(21,462)	(52,460)	(47,329)
Depreciation and amortization	1,779	1,874	3,677	3,713
Capital expenditures	$ 1,681	$ 421	$ 2,652	$ 1,212

Segment Information - Revenue Per Significant Product or Service (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 27, 2015	Jun. 28, 2014	Jun. 27, 2015	Jun. 28, 2014
Segment Reporting Information [Line Items]
Revenue	$ 339,573	$ 341,179	$ 659,987	$ 640,547
Research Models and Services
Segment Reporting Information [Line Items]
Revenue	120,044	133,120	240,055	265,615
Discovery and Safety Assessment
Segment Reporting Information [Line Items]
Revenue	153,375	142,614	293,387	247,752
Endotoxin and Microbial Detection
Segment Reporting Information [Line Items]
Revenue	33,653	33,579	66,479	66,045
Other manufacturing support
Segment Reporting Information [Line Items]
Revenue	32,501	31,866	60,066	61,135
Manufacturing Support
Segment Reporting Information [Line Items]
Revenue	$ 66,154	$ 65,445	$ 126,545	$ 127,180

Segment Information - Summary of Unallocated Corporate Overhead (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 27, 2015	Jun. 28, 2014	Jun. 27, 2015	Jun. 28, 2014
Segment Reporting Information [Line Items]
Stock-based compensation expense	$ 10,199	$ 8,222	$ 19,873	$ 14,881
Depreciation expense	17,400	17,400	34,500	33,200
Unallocated corporate
Segment Reporting Information [Line Items]
Stock-based compensation expense	6,419	4,905	12,699	8,607
Salary, bonus and fringe	7,234	7,438	17,930	17,705
Consulting, audit and professional services	3,130	2,437	6,771	5,668
IT related expenses	1,685	1,323	3,549	2,900
Depreciation expense	1,779	1,874	3,677	3,713
Acquisition related adjustments	3,956	1,371	3,594	4,676
Other general unallocated corporate expenses	2,103	2,114	4,240	4,060
Total unallocated corporate overhead costs	$ 26,306	$ 21,462	$ 52,460	$ 47,329

Subsequent Events (Details) $ in Millions	Jul. 24, 2015 USD ($)
Celsis International Ltd. \| Subsequent Event
Subsequent Event [Line Items]
Preliminary purchase price	$ 212.0