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Accrued Expenses (Details) - USD ($)
$ in Thousands
Dec. 30, 2017
Dec. 31, 2016
Accrued Expenses    
Compensation and related expenses $ 80,105 $ 67,582
Income taxes payable 153 534
Other 14,315 7,165
Total 94,573 75,281
Compensation and related expenses    
Accrued bonuses 63,800 53,900
"Other" accrued expenses    
Commissions due to senior consultants 6,100  
Direct project accruals 1,300 800
Forgivable loan accruals   800
Operating expense accruals 4,400 $ 5,600
Accrued leasehold improvements $ 2,500