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SEGMENT INFORMATION - Summary of Unallocated Corporate Overhead (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 26, 2021 | Jun. 27, 2020 | Jun. 26, 2021 | Jun. 27, 2020
Segment Reporting Information [Line Items] |  |  |  |
Stock-based compensation | $ 17,077 | $ 13,143 | $ 30,266 | $ 24,103
Unallocated corporate |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Stock-based compensation | 10,417 | 8,203 | 18,059 | 14,907
Compensation, benefits, and other employee-related expenses | 25,924 | 20,749 | 53,286 | 42,729
External consulting and other service expenses | 6,301 | 4,917 | 13,657 | 7,386
Information technology | 4,117 | 4,235 | 8,212 | 7,951
Depreciation | 722 | 745 | 1,373 | 1,557
Acquisition and integration | 15,036 | 869 | 25,596 | 7,852
Other general unallocated corporate | 3,744 | 2,529 | 7,696 | 6,352
Total unallocated corporate expense | $ 66,261 | $ 42,247 | $ 127,879 | $ 88,734

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