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Segment Information - Summary of Unallocated Corporate Overhead (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Apr. 01, 2017
Segment Reporting Information [Line Items]
Stock-based compensation	$ 10,541	$ 9,486
Unallocated corporate
Segment Reporting Information [Line Items]
Stock-based compensation	6,991	5,583
Compensation, benefits, and other employee-related expenses	20,596	14,381
External consulting and other service expenses	2,934	5,767
Information technology	2,465	2,393
Depreciation	1,834	1,987
Acquisition and integration	2,864	21
Other general unallocated corporate	2,396	2,787
Total unallocated corporate expense	$ 40,080	$ 32,919

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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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
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-Section S99
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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
-Topic 230
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-Section 45
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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
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.6)
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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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