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Segment Information - Revenue and Other Financial Information by Reportable Segment (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 26, 2016	Mar. 28, 2015
Segment Reporting Information [Line Items]
Revenue	$ 354,868	$ 320,414
Operating income	51,472	43,005
Depreciation and amortization	24,655	22,368
Capital expenditures	8,250	10,648
Operating segments
Segment Reporting Information [Line Items]
Operating income	86,831	69,159
Depreciation and amortization	23,183	20,470
Capital expenditures	7,889	9,677
RMS | Operating segments
Segment Reporting Information [Line Items]
Revenue	124,010	120,011
Operating income	36,533	28,845
Depreciation and amortization	5,281	6,045
Capital expenditures	1,053	2,733
DSA | Operating segments
Segment Reporting Information [Line Items]
Revenue	157,983	140,012
Operating income	30,830	23,516
Depreciation and amortization	11,957	11,139
Capital expenditures	4,707	5,378
Manufacturing | Operating segments
Segment Reporting Information [Line Items]
Revenue	72,875	60,391
Operating income	19,468	16,798
Depreciation and amortization	5,945	3,286
Capital expenditures	$ 2,129	$ 1,566

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=56944662&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=56944662&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=26872669&loc=d3e20235-122688

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