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Accrued Expenses (Details) - USD ($) $ in Thousands | Sep. 26, 2020 | Dec. 28, 2019
--- | --- | ---
Accrued Liabilities, Current [Abstract] |  |
Compensation and related expenses | $ 92,200 | $ 99,993
Income taxes payable | 488 | 430
Commissions due to non-employee experts | 1,808 | 9,961
Other professional fees | 2,116 | 2,077
Direct project accruals | 3,622 | 3,201
Accrued leasehold improvements | 441 | 2,166
Other | 3,277 | 3,473
Total accrued expenses | 103,952 | 121,301
Compensation and related expenses |  |
Accrued bonuses | $ 71,300 | $ 81,200

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