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Segment Information - Summary of Unallocated Corporate Overhead (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 01, 2017	Mar. 26, 2016
Segment Reporting Information [Line Items]
Stock-based compensation	$ 9,486	$ 9,941
Unallocated corporate
Segment Reporting Information [Line Items]
Stock-based compensation	5,583	6,108
Compensation, benefits, and other employee-related expenses	14,962	12,541
External consulting and other service expenses	5,767	5,176
Information technology	2,393	3,132
Depreciation	1,987	1,472
Acquisition and integration	21	3,763
Other general unallocated corporate	2,787	3,167
Total unallocated corporate expense	$ 33,500	$ 35,359

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- Definition

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

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

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 225
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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
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Amount of general expenses not normally included in Other Operating Costs and Expenses.

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-Name Accounting Standards Codification
-Topic 225
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-Section S99
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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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