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Segment Information - Revenue and Other Financial Information by Reportable Segment (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jul. 01, 2017 | Jun. 25, 2016 | Jul. 01, 2017 | Jun. 25, 2016
Segment Reporting Information [Line Items] |  |  |  |
Revenue | $ 469,129 | $ 434,055 | $ 914,892 | $ 788,923
Operating income | 81,310 | 58,061 | 150,782 | 109,533
Depreciation and amortization | 31,799 | 32,353 | 64,210 | 57,008
Capital expenditures | 15,997 | 11,791 | 31,917 | 20,041
Operating segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating income | 114,310 | 94,947 | 217,282 | 181,778
Depreciation and amortization | 29,697 | 30,243 | 60,120 | 53,426
Capital expenditures | 13,445 | 11,281 | 26,663 | 19,170
RMS | Operating segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 124,002 | 125,058 | 251,163 | 248,397
Operating income | 33,579 | 35,445 | 71,290 | 71,831
Depreciation and amortization | 4,945 | 5,118 | 10,037 | 10,368
Capital expenditures | 4,404 | 2,381 | 7,007 | 3,434
DSA | Operating segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 252,092 | 221,059 | 479,850 | 379,042
Operating income | 51,690 | 32,381 | 90,350 | 63,211
Depreciation and amortization | 18,965 | 18,600 | 38,334 | 30,557
Capital expenditures | 7,102 | 4,644 | 15,425 | 9,351
Manufacturing | Operating segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 93,035 | 87,938 | 183,879 | 161,484
Operating income | 29,041 | 27,121 | 55,642 | 46,736
Depreciation and amortization | 5,787 | 6,525 | 11,749 | 12,501
Capital expenditures | $ 1,939 | $ 4,256 | $ 4,231 | $ 6,385

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