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REVENUE FROM CONTRACTS WITH CUSTOMERS - Disaggregation of Revenues by Major Business Line (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 27, 2020 | Jun. 29, 2019 | Jun. 27, 2020 | Jun. 29, 2019
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue | $ 682,584 | $ 657,568 | $ 1,389,643 | $ 1,262,137
RMS |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue | 116,549 | 136,054 | 262,545 | 273,226
RMS | Services and products transferred over time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue | 57,357 | 57,321 | 117,398 | 112,134
RMS | Services and products transferred at a point in time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue | 59,192 | 78,733 | 145,147 | 161,092
DSA |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue | 442,564 | 405,517 | 881,247 | 759,714
DSA | Services and products transferred over time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue | 442,447 | 405,351 | 881,011 | 759,429
DSA | Services and products transferred at a point in time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue | 117 | 166 | 236 | 285
Manufacturing |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue | 123,471 | 115,997 | 245,851 | 229,197
Manufacturing | Services and products transferred over time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue | 41,317 | 34,470 | 78,631 | 66,366
Manufacturing | Services and products transferred at a point in time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue | $ 82,154 | $ 81,527 | $ 167,220 | $ 162,831

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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 280 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8906-108599 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 40 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9031-108599 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9038-108599 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599 Reference 6: 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=121604090&loc=SL49130543-203045 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8736-108599 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8736-108599 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 42 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9054-108599 Reference 10: 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=121604090&loc=SL49130545-203045 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 924 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 11.L) -URI http://asc.fasb.org/extlink&oid=6472922&loc=d3e499488-122856 + Details
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