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Accrued Expenses (Details) - USD ($)
$ in Thousands
Oct. 02, 2021
Jan. 02, 2021
Accrued Liabilities, Current [Abstract]    
Compensation and related expenses $ 119,394 $ 123,540
Income taxes payable 655 1,927
Performance awards 571 2,176
Other professional fees 1,677 1,541
Direct project accruals 3,012 3,988
Accrued leasehold improvements 39 52
Other 3,353 3,152
Total accrued expenses 128,701 136,376
Compensation and related expenses    
Accrued bonuses $ 93,500 $ 102,600