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Segment Information - Revenue and Other Financial Information by Reportable Segment (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Apr. 01, 2017 | Mar. 26, 2016
Segment Reporting Information [Line Items] |  |
Revenue | $ 445,763 | $ 354,868
Operating income | 69,472 | 51,472
Depreciation and amortization | 32,411 | 24,655
Capital expenditures | 15,920 | 8,250
Operating segments |  |
Segment Reporting Information [Line Items] |  |
Operating income | 102,972 | 86,831
Depreciation and amortization | 30,423 | 23,183
Capital expenditures | 13,218 | 7,889
RMS | Operating segments |  |
Segment Reporting Information [Line Items] |  |
Revenue | 127,161 | 123,339
Operating income | 37,711 | 36,386
Depreciation and amortization | 5,092 | 5,250
Capital expenditures | 2,603 | 1,053
DSA | Operating segments |  |
Segment Reporting Information [Line Items] |  |
Revenue | 227,758 | 157,983
Operating income | 38,660 | 30,830
Depreciation and amortization | 19,369 | 11,957
Capital expenditures | 8,323 | 4,707
Manufacturing | Operating segments |  |
Segment Reporting Information [Line Items] |  |
Revenue | 90,844 | 73,546
Operating income | 26,601 | 19,615
Depreciation and amortization | 5,962 | 5,976
Capital expenditures | $ 2,292 | $ 2,129

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