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Segment Information - Revenue and Other Financial Information by Reportable Segment (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 24, 2016 | Sep. 30, 2017 | Sep. 24, 2016
Segment Reporting Information [Line Items] |  |  |  |
Revenue | $ 464,232 | $ 425,720 | $ 1,379,124 | $ 1,214,643
Operating income | 73,984 | 58,795 | 224,766 | 168,328
Depreciation and amortization | 33,465 | 34,108 | 97,675 | 91,116
Capital expenditures | 22,011 | 9,568 | 53,928 | 29,609
Operating segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating income | 109,265 | 89,238 | 326,547 | 271,016
Depreciation and amortization | 31,177 | 32,097 | 91,297 | 85,523
Capital expenditures | 19,768 | 8,903 | 46,432 | 28,073
RMS | Operating segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 122,020 | 120,928 | 373,183 | 369,325
Operating income | 30,726 | 31,224 | 102,016 | 103,055
Depreciation and amortization | 5,272 | 5,245 | 15,309 | 15,613
Capital expenditures | 6,762 | 2,532 | 13,769 | 5,966
DSA | Operating segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 246,946 | 215,817 | 726,796 | 594,859
Operating income | 46,616 | 31,303 | 136,966 | 94,514
Depreciation and amortization | 20,333 | 20,671 | 58,667 | 51,228
Capital expenditures | 10,127 | 4,509 | 25,552 | 13,860
Manufacturing | Operating segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 95,266 | 88,975 | 279,145 | 250,459
Operating income | 31,923 | 26,711 | 87,565 | 73,447
Depreciation and amortization | 5,572 | 6,181 | 17,321 | 18,682
Capital expenditures | $ 2,879 | $ 1,862 | $ 7,111 | $ 8,247

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