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SEGMENT INFORMATION - Summary of Unallocated Corporate Overhead (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 30, 2019	Mar. 31, 2018
Segment Reporting Information [Line Items]
Stock-based compensation	$ 12,899	$ 10,541
Unallocated corporate
Segment Reporting Information [Line Items]
Stock-based compensation	8,274	6,991
Compensation, benefits, and other employee-related expenses	22,038	20,596
External consulting and other service expenses	3,810	2,934
Information technology	2,723	2,465
Depreciation	1,447	1,834
Acquisition and integration	5,472	2,864
Other general unallocated corporate	2,480	2,396
Total unallocated corporate expense	$ 46,244	$ 40,080

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

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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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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.

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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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