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Business Segment Information (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Mar. 31, 2012
segments
Jun. 25, 2011
Jun. 30, 2012
Jun. 25, 2011
Segment Reporting [Abstract]          
Number of reportable segments   2      
Business segment information          
Net sales $ 284,723   $ 288,263 $ 570,704 $ 574,106
Operating income 49,274   53,314 93,014 95,565
Depreciation and amortization       40,067 43,081
Capital expenditures       23,553 13,450
Unallocated corporate overhead          
Stock-based compensation expense 5,321   5,430 10,586 11,348
Depreciation expense       31,161 31,904
Tax Exempt Gain on Settlement of Life Insurance 0   (7,710) 0 (7,710)
Research Models [Member]
          
Business segment information          
Net sales 87,119   90,190 181,140 183,590
Research Model Services [Member]
          
Business segment information          
Net sales 53,975   55,422 110,306 107,397
Other Products [Member]
          
Business segment information          
Net sales 32,517   32,551 65,317 60,547
Total Segments [Member]
          
Business segment information          
Operating income 66,351   63,566 129,992 124,614
Research Models and Services [Member]
          
Business segment information          
Net sales 173,611   178,163 356,763 351,534
Gross margin 76,266   78,307 158,462 152,146
Operating income 55,542   55,691 115,009 107,433
Depreciation and amortization 9,085   9,318 18,027 18,587
Capital expenditures 7,569   4,010 20,469 8,413
Preclinical Services [Member]
          
Business segment information          
Net sales 111,112   110,100 213,941 222,572
Gross margin 27,319   28,013 49,335 56,812
Operating income 10,809   7,875 14,983 17,181
Depreciation and amortization 10,980   12,498 22,040 24,494
Capital expenditures 1,872   2,650 3,084 5,037
Unallocated Corporate Overhead [Member]
          
Business segment information          
Operating income (17,077)   (10,252) (36,978) (29,049)
Unallocated corporate overhead          
Stock-based compensation expense 2,900   2,528 5,685 5,514
U.S. retirement plans 1,014   1,055 2,386 2,112
Audit, tax and related expenses 637   505 1,291 1,260
Salary and bonus 4,866   4,642 9,789 9,335
Global IT 3,366   2,794 6,216 5,787
Employee health, long-term disability and fringe benefit expense (1,140)   675 853 2,314
Consulting and professional services 778   2,201 2,520 3,532
Depreciation expense 1,570   1,593 3,139 3,174
Other general unallocated corporate expenses 3,086   1,969 5,099 3,731
Total unallocated corporate overhead costs $ 17,077   $ 10,252 $ 36,978 $ 29,049