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SEGMENT AND GEOGRAPHIC INFORMATION - Financial Information by Reportable Business Segment (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 30, 2017	Sep. 30, 2017	Jul. 01, 2017	Apr. 01, 2017	Dec. 31, 2016	Sep. 24, 2016	Jun. 25, 2016	Mar. 26, 2016	Dec. 30, 2017	Dec. 31, 2016	Dec. 26, 2015
Segment Reporting Information [Line Items]
Revenue	$ 478,477	$ 464,232	$ 469,129	$ 445,763	$ 466,789	$ 425,720	$ 434,055	$ 354,868	$ 1,857,601	$ 1,681,432	$ 1,363,302
Operating income	$ 62,732	$ 73,984	$ 81,310	$ 69,472	$ 69,091	$ 58,795	$ 58,061	$ 51,472	287,498	237,419	206,449
Depreciation and amortization									131,159	126,658	94,881
Capital expenditures									82,431	55,288	63,252
RMS
Segment Reporting Information [Line Items]
Revenue									493,615	494,037	470,411
Operating income									114,712	136,365	120,973
Depreciation and amortization									19,627	20,853	22,526
Capital expenditures									20,879	11,642	17,398
DSA
Segment Reporting Information [Line Items]
Revenue									980,022	836,593	612,173
Operating income									184,063	138,157	121,981
Depreciation and amortization									79,355	71,816	46,812
Capital expenditures									36,616	27,493	30,333
Manufacturing
Segment Reporting Information [Line Items]
Revenue									383,964	350,802	280,718
Operating income									123,903	104,543	74,675
Depreciation and amortization									22,893	25,566	18,129
Capital expenditures									$ 15,188	$ 12,247	$ 9,814

X

- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

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The cash outflow for purchases of and capital improvements on property, plant and equipment (capital expenditures), software, and other intangible assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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