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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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