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Segment Information - Revenue and Other Financial Information by Reportable Segment (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2018 | Apr. 01, 2017
Segment Reporting Information [Line Items] |  |
Total revenue | $ 493,970 | $ 445,763
Operating income | 67,829 | 69,706
Depreciation and amortization | 33,210 | 32,411
Capital expenditures | 27,726 | 15,920
RMS |  |
Segment Reporting Information [Line Items] |  |
Total revenue | 133,958 | 127,161
Operating income | 38,527 | 37,690
Depreciation and amortization | 4,853 | 5,092
Capital expenditures | 4,625 | 2,603
DSA |  |
Segment Reporting Information [Line Items] |  |
Total revenue | 259,992 | 227,758
Operating income | 40,859 | 38,335
Depreciation and amortization | 20,787 | 19,369
Capital expenditures | 12,802 | 8,323
Manufacturing |  |
Segment Reporting Information [Line Items] |  |
Total revenue | 100,020 | 90,844
Operating income | 28,523 | 26,600
Depreciation and amortization | 5,736 | 5,962
Capital expenditures | $ 6,834 | $ 2,292

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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 32 -Paragraph 2A -URI http://asc.fasb.org/extlink&oid=82859839&loc=SL82860478-203043 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130543-203045 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130539-203045 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130545-203045 + Details
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