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SEGMENT INFORMATION - Summary of Unallocated Corporate Overhead (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 27, 2020	Jun. 29, 2019	Jun. 27, 2020	Jun. 29, 2019
Segment Reporting Information [Line Items]
Stock-based compensation	$ 13,143	$ 16,505	$ 24,103	$ 29,404
Unallocated corporate
Segment Reporting Information [Line Items]
Stock-based compensation	8,203	10,718	14,907	18,992
Compensation, benefits, and other employee-related expenses	20,749	13,753	42,729	35,791
External consulting and other service expenses	4,917	4,094	7,386	7,904
Information technology	4,235	4,555	7,951	7,277
Depreciation	745	834	1,557	2,281
Acquisition and integration	869	12,470	7,852	17,942
Other general unallocated corporate	2,529	1,975	6,352	4,456
Total unallocated corporate expense	$ 42,247	$ 48,399	$ 88,734	$ 94,643

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

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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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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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