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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. 31, 2016	Sep. 24, 2016	Jun. 25, 2016	Mar. 26, 2016	Dec. 26, 2015	Sep. 26, 2015	Jun. 27, 2015	Mar. 28, 2015	Dec. 31, 2016	Dec. 26, 2015	Dec. 27, 2014
Segment Reporting Information [Line Items]
Revenue	$ 466,789	$ 425,720	$ 434,055	$ 354,868	$ 353,850	$ 349,465	$ 339,573	$ 320,414	$ 1,681,432	$ 1,363,302	$ 1,297,662
Operating income	$ 69,091	$ 58,795	$ 58,061	$ 51,472	$ 52,269	$ 55,440	$ 55,735	$ 43,005	237,419	206,449	177,670
Depreciation and amortization									126,658	94,881	96,445
Capital expenditures									55,288	63,252	56,925
RMS
Segment Reporting Information [Line Items]
Revenue									494,037	470,411	503,656
Operating income									136,365	120,973	120,736
Depreciation and amortization									20,853	22,526	27,309
Capital expenditures									11,642	17,398	18,669
DSA
Segment Reporting Information [Line Items]
Revenue									836,593	612,173	538,218
Operating income									138,157	121,981	69,749
Depreciation and amortization									71,816	46,812	47,138
Capital expenditures									27,493	30,333	19,759
Manufacturing
Segment Reporting Information [Line Items]
Revenue									350,802	280,718	255,788
Operating income									104,543	74,675	79,260
Depreciation and amortization									25,566	18,129	14,295
Capital expenditures									$ 12,247	$ 9,814	$ 15,621

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- 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=66902209&loc=d3e3602-108585

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- Definition

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
-Glossary Investing Activities
-URI http://asc.fasb.org/extlink&oid=6516133

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
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-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3213-108585

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+ 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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