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SEGMENT INFORMATION - Summary of Unallocated Corporate Overhead (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 28, 2020	Mar. 30, 2019
Segment Reporting Information [Line Items]
Stock-based compensation	$ 10,960	$ 12,899
Unallocated corporate
Segment Reporting Information [Line Items]
Stock-based compensation	6,704	8,274
Compensation, benefits, and other employee-related expenses	21,980	22,038
External consulting and other service expenses	2,469	3,810
Information technology	3,716	2,723
Depreciation	812	1,447
Acquisition and integration	6,983	5,472
Other general unallocated corporate	3,823	2,480
Total unallocated corporate expense	$ 46,487	$ 46,244

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