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Segment Information - Revenue and Other Financial Information by Reportable Segment (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Apr. 01, 2017
Segment Reporting Information [Line Items]
Total revenue	$ 493,970	$ 445,763
Operating income	67,829	69,706
Depreciation and amortization	33,210	32,411
Capital expenditures	27,726	15,920
RMS
Segment Reporting Information [Line Items]
Total revenue	133,958	127,161
Operating income	38,527	37,690
Depreciation and amortization	4,853	5,092
Capital expenditures	4,625	2,603
DSA
Segment Reporting Information [Line Items]
Total revenue	259,992	227,758
Operating income	40,859	38,335
Depreciation and amortization	20,787	19,369
Capital expenditures	12,802	8,323
Manufacturing
Segment Reporting Information [Line Items]
Total revenue	100,020	90,844
Operating income	28,523	26,600
Depreciation and amortization	5,736	5,962
Capital expenditures	$ 6,834	$ 2,292

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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- Definition

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+ 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)
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 32
-Paragraph 2A
-URI http://asc.fasb.org/extlink&oid=82859839&loc=SL82860478-203043

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 606
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-Section 50
-Paragraph 4
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-URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130543-203045

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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