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REVENUE FROM CONTRACTS WITH CUSTOMERS - Disaggregation of Revenues by Major Business Line (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 28, 2020 | Mar. 30, 2019
Disaggregation of Revenue [Line Items] |  |
Total revenue | $ 707,059 | $ 604,569
RMS |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue | 145,996 | 137,172
RMS | Services and products transferred over time |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue | 60,041 | 54,813
RMS | Services and products transferred at a point in time |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue | 85,955 | 82,359
DSA |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue | 438,683 | 354,197
DSA | Services and products transferred over time |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue | 438,564 | 354,078
DSA | Services and products transferred at a point in time |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue | 119 | 119
Manufacturing |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue | 122,380 | 113,200
Manufacturing | Services and products transferred over time |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue | 37,314 | 31,896
Manufacturing | Services and products transferred at a point in time |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue | $ 85,066 | $ 81,304

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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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045 + Details
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