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SEGMENT AND GEOGRAPHIC INFORMATION - Unallocated Corporate Costs (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 26, 2020 | Dec. 28, 2019 | Dec. 29, 2018
Segment Reporting Information [Line Items] |  |  |
Stock-based compensation | $ 56,341 | $ 57,271 | $ 47,346
Depreciation | 123,000 | 108,600 | 96,900
Unallocated corporate |  |  |
Segment Reporting Information [Line Items] |  |  |
Stock-based compensation | 34,111 | 37,855 | 32,068
Compensation, benefits, and other employee-related expenses | 73,814 | 73,893 | 69,191
External consulting and other service expenses | 26,561 | 16,639 | 18,652
Information technology | 18,912 | 16,080 | 12,463
Depreciation | 3,018 | 4,175 | 6,805
Acquisition and integration | 13,995 | 26,877 | 16,295
Other general unallocated corporate | 7,019 | 11,565 | 13,400
Total unallocated corporate expense | $ 177,430 | $ 187,084 | $ 168,874

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