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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