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SEGMENT INFORMATION - Summary of Unallocated Corporate Overhead (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 25, 2021	Sep. 26, 2020	Sep. 25, 2021	Sep. 26, 2020
Segment Reporting Information [Line Items]
Stock-based compensation	$ 22,023	$ 16,870	$ 52,289	$ 40,973
Unallocated corporate
Segment Reporting Information [Line Items]
Stock-based compensation	13,258	10,116	31,317	25,023
Compensation, benefits, and other employee-related expenses	17,249	20,812	70,535	63,541
External consulting and other service expenses	6,670	3,088	20,327	10,474
Information technology	4,074	4,937	12,286	12,888
Depreciation	734	763	2,107	2,320
Acquisition and integration	3,392	2,124	28,988	9,976
Other general unallocated corporate	3,043	1,109	10,739	7,461
Total unallocated corporate expense	$ 48,420	$ 42,949	$ 176,299	$ 131,683

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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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