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REVENUE FROM CONTRACTS WITH CUSTOMERS - Disaggregation of Revenues by Major Business Line (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 25, 2021	Dec. 26, 2020
Disaggregation of Revenue [Line Items]
Revenue	$ 3,976,060	$ 3,540,160	$ 2,923,933
RMS
Disaggregation of Revenue [Line Items]
Revenue	739,175	690,437	571,152
RMS | Services and products transferred over time
Disaggregation of Revenue [Line Items]
Revenue	340,708	263,659	240,480
RMS | Services and products transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenue	398,467	426,778	330,672
DSA
Disaggregation of Revenue [Line Items]
Revenue	2,447,316	2,107,231	1,837,428
DSA | Services and products transferred over time
Disaggregation of Revenue [Line Items]
Revenue	2,440,646	2,103,415	1,836,519
DSA | Services and products transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenue	6,670	3,816	909
Manufacturing
Disaggregation of Revenue [Line Items]
Revenue	789,569	742,492	515,353
Manufacturing | Services and products transferred over time
Disaggregation of Revenue [Line Items]
Revenue	371,500	335,745	174,254
Manufacturing | Services and products transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenue	$ 418,069	$ 406,747	$ 341,099

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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

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