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Segment Information - Revenue and Other Financial Information by Reportable Segment (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 01, 2017	Mar. 26, 2016
Segment Reporting Information [Line Items]
Revenue	$ 445,763	$ 354,868
Operating income	69,472	51,472
Depreciation and amortization	32,411	24,655
Capital expenditures	15,920	8,250
Operating segments
Segment Reporting Information [Line Items]
Operating income	102,972	86,831
Depreciation and amortization	30,423	23,183
Capital expenditures	13,218	7,889
RMS | Operating segments
Segment Reporting Information [Line Items]
Revenue	127,161	123,339
Operating income	37,711	36,386
Depreciation and amortization	5,092	5,250
Capital expenditures	2,603	1,053
DSA | Operating segments
Segment Reporting Information [Line Items]
Revenue	227,758	157,983
Operating income	38,660	30,830
Depreciation and amortization	19,369	11,957
Capital expenditures	8,323	4,707
Manufacturing | Operating segments
Segment Reporting Information [Line Items]
Revenue	90,844	73,546
Operating income	26,601	19,615
Depreciation and amortization	5,962	5,976
Capital expenditures	$ 2,292	$ 2,129

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=66902209&loc=d3e3602-108585

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- Definition

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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
-Paragraph 13
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=66902209&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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