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Segment Information - Summary of Unallocated Corporate Overhead (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 01, 2017	Jun. 25, 2016	Jul. 01, 2017	Jun. 25, 2016
Segment Reporting Information [Line Items]
Stock-based compensation	$ 11,890	$ 12,106	$ 21,376	$ 22,047
Corporate
Segment Reporting Information [Line Items]
Stock-based compensation	7,421	7,746	13,004	13,854
Compensation, benefits, and other employee-related expenses	11,079	7,738	26,041	20,279
External consulting and other service expenses	4,085	6,656	9,852	11,832
Information technology	3,617	2,364	6,010	5,496
Depreciation	2,102	2,111	4,090	3,583
Acquisition and integration	1,191	7,260	1,212	11,023
Other general unallocated corporate	3,505	3,011	6,291	6,178
Total unallocated corporate expense	$ 33,000	$ 36,886	$ 66,500	$ 72,245

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- Definition

Represents the sum total of audit, tax and related expenses.

+ References

No definition available.

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- Definition

Expenditures for salaries and bonuses for officers and non-officers. Does not include allocated share-based compensation, pension and post-retirement benefit expense.

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No definition available.

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- Definition

Amount of direct costs of the business combination or disposition including legal, accounting, and other costs incurred to consummate the business acquisition or disposition.

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- Definition

Represents the amount of unallocated corporate expenses.

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- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 14.F)
-URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901

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-Section 50
-Paragraph 2
-Subparagraph (h)(1)(i)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Definition

The amount of expense in the period for communications and data processing expense.

+ 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 210.5-03.4)
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- Definition

The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

+ 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)
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Amount of general expenses not normally included in Other Operating Costs and Expenses.

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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 210.5-03.6)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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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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