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Accrued Expenses (Details) - USD ($)
$ in Thousands
Dec. 29, 2018
Dec. 30, 2017
Accrued Expenses    
Compensation and related expenses $ 90,711 $ 80,105
Income taxes payable 514 153
Other 17,008 14,315
Total 108,233 94,573
Compensation and related expenses    
Accrued bonuses 73,900 63,800
"Other" accrued expenses    
Commissions due to senior consultants 9,600 6,100
Direct project accruals 700 1,300
Operating expense accruals 6,600 4,400
Accrued leasehold improvements $ 100 $ 2,500