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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

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