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SEGMENT INFORMATION - Summary of Unallocated Corporate Overhead (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 27, 2020 | Jun. 29, 2019 | Jun. 27, 2020 | Jun. 29, 2019
Segment Reporting Information [Line Items] |  |  |  |
Stock-based compensation | $ 13,143 | $ 16,505 | $ 24,103 | $ 29,404
Unallocated corporate |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Stock-based compensation | 8,203 | 10,718 | 14,907 | 18,992
Compensation, benefits, and other employee-related expenses | 20,749 | 13,753 | 42,729 | 35,791
External consulting and other service expenses | 4,917 | 4,094 | 7,386 | 7,904
Information technology | 4,235 | 4,555 | 7,951 | 7,277
Depreciation | 745 | 834 | 1,557 | 2,281
Acquisition and integration | 869 | 12,470 | 7,852 | 17,942
Other general unallocated corporate | 2,529 | 1,975 | 6,352 | 4,456
Total unallocated corporate expense | $ 42,247 | $ 48,399 | $ 88,734 | $ 94,643

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