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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

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