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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. 30, 2019 | Mar. 31, 2018
Segment Reporting Information [Line Items] |  |
Total revenue | $ 604,569 | $ 493,970
Operating income | 69,792 | 67,829
Depreciation and amortization | 45,358 | 33,210
Capital expenditures | 16,731 | 27,726
RMS |  |
Segment Reporting Information [Line Items] |  |
Total revenue | 137,172 | 133,958
Operating income | 37,832 | 38,527
Depreciation and amortization | 4,322 | 4,853
Capital expenditures | 4,112 | 4,625
DSA |  |
Segment Reporting Information [Line Items] |  |
Total revenue | 354,197 | 259,992
Operating income | 46,705 | 40,859
Depreciation and amortization | 33,784 | 20,787
Capital expenditures | 8,848 | 12,802
Manufacturing |  |
Segment Reporting Information [Line Items] |  |
Total revenue | 113,200 | 100,020
Operating income | 31,499 | 28,523
Depreciation and amortization | 5,805 | 5,736
Capital expenditures | $ 3,606 | $ 6,834

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045 + Details
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