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SEGMENT INFORMATION - Summary of Unallocated Corporate Overhead (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 27, 2021
Mar. 28, 2020
Segment Reporting Information [Line Items]    
Stock-based compensation $ 13,189 $ 10,960
Unallocated corporate    
Segment Reporting Information [Line Items]    
Stock-based compensation 7,642 6,704
Compensation, benefits, and other employee-related expenses 27,362 21,980
External consulting and other service expenses 7,356 2,469
Information technology 4,095 3,716
Depreciation 652 812
Acquisition and integration 10,560 6,983
Other general unallocated corporate 3,951 3,823
Total unallocated corporate expense $ 61,618 $ 46,487