Description of Business and Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2011

Description of Business and Summary of Significant Accounting Policies [Abstract]

Composition of Trade Receivables

The composition of net trade receivables is as follows:

	December 31, 2011			December 25, 2010
Client receivables	$	159,381		$	170,696
Unbilled revenue	29,446			27,095
Total	188,827			197,791
Less allowance for doubtful accounts	(4,017		)	(4,819		)
Net trade receivables	$	184,810		$	192,972

Schedule of Marketable Securities by Major Security Type

The amortized cost, gross unrealized gains, gross unrealized losses and fair value for marketable securities by major security type were as follows:

	December 31, 2011
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
Time deposits	$	5,359	$	—	$	—		$	5,359
Auction rate securities	11,972		—		(921		)	11,051
	$	17,331	$	—	$	(921	)	$	16,410

	December 25, 2010
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
Time deposits	$	9,834	$	—	$	—		$	9,834
Auction rate securities	11,974		—		(597		)	11,377
	$	21,808	$	—	$	(597	)	$	21,211

Schedule of Maturities of Debt Securities

Maturities of debt securities were as follows:

	December 31, 2011				December 25, 2010
	Amortized Cost		Fair Value		Amortized Cost		Fair Value
Due less than one year	$	5,359	$	5,359	$	9,834	$	9,834
Due after one year through five years	—		—		—		—
Due after ten years	11,972		11,051		11,974		11,377
	$	17,331	$	16,410	$	21,808	$	21,211

Composition of Inventories

The composition of inventories is as follows:

	December 31, 2011		December 25, 2010
Raw materials and supplies	$	13,987	$	13,153
Work in process	13,533		13,869
Finished products	65,449		73,275
Inventories	$	92,969	$	100,297

Composition of Current Assets

Other current assets consist of assets we intend to settle within the next twelve months.

	December 31, 2011		December 25, 2010
Prepaid assets	$	22,828	$	21,434
Deferred tax asset	30,894		31,251
Marketable securities	5,359		9,834
Prepaid income tax	19,742		13,856
Restricted cash	229		228
Other current assets	$	79,052	$	76,603

Composition of Net Property, Plant and Equipment

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

	December 31, 2011			December 25, 2010
Land	$	40,517		$	40,409
Buildings	696,275			694,342
Machinery and equipment	348,795			327,353
Leasehold improvements	29,975			26,772
Furniture and fixtures	10,663			10,473
Vehicles	5,226			5,456
Computer hardware and software	105,563			106,073
Construction in progress	57,661			45,465
Total	1,294,675			1,256,343
Less accumulated depreciation	(556,645		)	(503,686		)
Net property, plant and equipment	$	738,030		$	752,657

Composition of Other Assets

The composition of other assets is as follows:

	December 31, 2011		December 25, 2010
Deferred financing costs	$	9,239	$	11,167
Cash surrender value of life insurance policies	25,057		31,054
Long term marketable securities	11,051		11,377
Other assets	12,312		8,725
Other assets	$	57,659	$	62,323

Schedule of Restructuring and Contract Termination Costs

The following table rolls forward our severance and retention cost liability:

	Severance and Retention Costs
	2011			2010			2009
Balance, beginning of period	$	10,658		$	4,332		$	639
Expense	5,462			16,504			16,334
Payments/utilization	(12,746		)	(10,178		)	(12,641		)
Balance, end of period	$	3,374		$	10,658		$	4,332

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

	Fiscal Year Ended
	2011		2010		2009
Severance charges included in cost of sales	$	1,012	$	10,860	$	5,005
Severance charges included in selling, general and administrative expense	4,450		5,644		11,339
Total expense	$	5,462	$	16,504	$	16,344

The following table presents severance and retention cost by segment:

	Fiscal Year Ended
	2011			2010		2009
Research models and services	$	1,196		$	4,429	$	3,997
Preclinical services	4,372			9,145		9,722
Corporate	(106		)	2,930		2,625
Total expense	$	5,462		$	16,504	$	16,344

Composition of Other Current Liabilities

The composition of other current liabilities is as follows:

	December 31, 2011		December 25, 2010
Accrued income taxes	$	10,552	$	18,372
Current deferred tax liability	1,379		963
Accrued interest and other	2,102		760
Other current liabilities	$	14,033	$	20,095

Composition of Other Long-Term Liabilities

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

	December 31, 2011		December 25, 2010
Deferred tax liability	$	16,074	$	30,050
Long-term pension liability	49,223		36,335
Accrued Executive Supplemental Life Insurance Retirement Plan and Deferred Compensation Plan	25,739		24,659
Other long-term liabilities	17,415		23,552
Other long-term liabilities	$	108,451	$	114,596

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:

	Fair Value Measurements at December 31, 2011 using
	Quoted Prices in Active Markets for Identical Assets Level 1		Significant Other Observable Inputs Level 2		Significant Unobservable Inputs Level 3		Assets and Liabilities at Fair Value
Time deposits	$	—	$	5,359	$	—	$	5,359
Auction rate securities	—		—		11,051		11,051
Fair value of life policies	—		19,520		—		19,520
Hedge contract	—		5		—		5
Total assets measured at fair value	$	—	$	24,884	$	11,051	$	35,935
Contingent consideration	—		—		—		—
Total liabilities measured at fair value	$	—	$	—	$	—	$	—

	Fair Value Measurements at December 25, 2010 using
	Quoted Prices in Active Markets for Identical Assets Level 1		Significant Other Observable Inputs Level 2		Significant Unobservable Inputs Level 3		Assets and Liabilities at Fair Value
Time deposits	$	—	$	9,834	$	—	$	9,834
Auction rate securities	—		—		11,377		11,377
Fair value of life policies	—		25,609		—		25,609
Hedge contract	—		419		—		419
Total assets measured at fair value	$	—	$	35,862	$	11,377	$	47,239
Contingent consideration	—		—		5,365		5,365
Total liabilities measured at fair value	$	—	$	—	$	5,365	$	5,365

Reconcilliation of Assets and Liabilities Measured at Fair Value on Recurring Basis (Level 3)

The following table presents a reconciliation for all assets measured at fair value on a recurring basis using significant unobservable inputs (Level 3) during the years ended December 31, 2011 and December 25, 2010. Our auction rate securities were valued at fair value by management in part utilizing an independent valuation reviewed by management which used pricing models and discounted cash flow methodologies incorporating assumptions that reflect the assumptions a marketplace participant would use at December 31, 2011.

	Fair Value Measurements Using Significant Unobservable Inputs (Level 3)
	Year ended
Auction rate securities	December 31, 2011			December 25, 2010
Beginning balance	$	11,377		$	16,212
Transfers in and/or out of Level 3	—			—
Total gains or losses (realized/unrealized):
Included in earnings (other expenses)	(1		)	14
Included in other comprehensive income	(325		)	651
Purchases, issuances and settlements	—			(5,500		)
Ending balance	$	11,051		$	11,377

	Fair Value Measurements Using Significant Unobservable Inputs (Level 3)
	Year ended
Contingent Consideration	December 31, 2011			December 25, 2010
Beginning balance	$	5,365		$	9,300
Transfers in and/or out of Level 3	—			—
Total gains or losses (realized/unrealized):
Included in selling, general and administrative expense	(5,365		)	(3,935		)
Included in other comprehensive income	—			—
Purchases, issuances and settlements	—			—
Ending balance	$	—		$	5,365