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Accrued Expenses (Details) - USD ($)
$ in Thousands
Sep. 29, 2018
Dec. 30, 2017
Accrued Expenses    
Compensation and related expenses $ 67,616 $ 80,105
Income taxes payable 661 153
Other 13,621 14,315
Total 81,898 94,573
Compensation and related expenses    
Accrued bonuses 53,100 63,800
"Other" accrued expenses    
Commissions due to senior consultants 6,200 6,100
Direct project accruals 800 1,300
Operating expense accruals 6,100 4,400
Accrued leasehold improvements $ 500 $ 2,500