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SEGMENT INFORMATION - Summary of Unallocated Corporate Overhead (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 26, 2020	Sep. 28, 2019	Sep. 26, 2020	Sep. 28, 2019
Segment Reporting Information [Line Items]
Stock-based compensation	$ 16,870	$ 14,025	$ 40,973	$ 43,429
Unallocated corporate
Segment Reporting Information [Line Items]
Stock-based compensation	10,116	8,752	25,023	27,744
Compensation, benefits, and other employee-related expenses	20,812	18,770	63,541	54,561
External consulting and other service expenses	3,088	4,156	10,474	12,060
Information technology	4,937	3,534	12,888	10,811
Depreciation	763	975	2,320	3,256
Acquisition and integration	2,124	5,679	9,976	23,621
Other general unallocated corporate	1,109	3,965	7,461	8,421
Total unallocated corporate expense	$ 42,949	$ 45,831	$ 131,683	$ 140,474

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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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