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SEGMENT INFORMATION - Revenue and Other Financial Information by Reportable Segment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 29, 2018	Sep. 30, 2017	Sep. 29, 2018	Sep. 30, 2017
Segment Reporting Information [Line Items]
Total revenue	$ 585,295	$ 464,232	$ 1,664,566	$ 1,379,124
Operating income	84,362	74,062	228,901	225,454
Depreciation and amortization	43,592	33,465	120,198	97,675
Capital expenditures	22,439	22,011	71,378	53,928
RMS
Segment Reporting Information [Line Items]
Total revenue	126,811	122,020	391,195	373,183
Operating income	32,121	30,665	104,893	101,949
Depreciation and amortization	4,811	5,272	14,565	15,309
Capital expenditures	8,166	6,762	18,105	13,769
DSA
Segment Reporting Information [Line Items]
Total revenue	352,257	246,946	958,665	726,796
Operating income	62,909	46,324	160,391	135,994
Depreciation and amortization	31,433	20,333	83,262	58,667
Capital expenditures	10,800	10,127	34,496	25,552
Manufacturing
Segment Reporting Information [Line Items]
Total revenue	106,227	95,266	314,706	279,145
Operating income	33,266	31,920	95,904	87,563
Depreciation and amortization	5,709	5,572	17,313	17,321
Capital expenditures	$ 2,709	$ 2,879	$ 12,731	$ 7,111

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The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.

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