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Segment Information - Revenue and Other Financial Information by Reportable Segment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 24, 2016	Sep. 26, 2015	Sep. 24, 2016	Sep. 26, 2015
Segment Reporting Information [Line Items]
Revenue	$ 425,720	$ 349,465	$ 1,214,643	$ 1,009,452
Operating income	58,795	55,440	168,328	154,180
Depreciation and amortization	34,108	23,814	91,116	69,330
Capital expenditures	9,568	10,452	29,609	35,008
Operating segments
Segment Reporting Information [Line Items]
Operating income	89,238	83,109	271,016	234,309
Depreciation and amortization	32,097	21,967	85,523	63,806
Capital expenditures	8,903	9,438	28,073	31,342
RMS | Operating segments
Segment Reporting Information [Line Items]
Revenue	120,928	117,894	369,325	356,570
Operating income	31,224	31,427	103,055	93,581
Depreciation and amortization	5,245	5,279	15,613	16,590
Capital expenditures	2,532	3,022	5,966	12,111
DSA | Operating segments
Segment Reporting Information [Line Items]
Revenue	215,817	158,272	594,859	451,659
Operating income	31,303	33,191	94,514	84,856
Depreciation and amortization	20,671	11,509	51,228	35,060
Capital expenditures	4,509	4,277	13,860	13,756
Manufacturing | Operating segments
Segment Reporting Information [Line Items]
Revenue	88,975	73,299	250,459	201,223
Operating income	26,711	18,491	73,447	55,872
Depreciation and amortization	6,181	5,179	18,682	12,156
Capital expenditures	$ 1,862	$ 2,139	$ 8,247	$ 5,475

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

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
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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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