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Correction (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 29, 2018
Dec. 30, 2017
Dec. 31, 2016
Mar. 31, 2018
Correction        
Non-current liabilities $ 31,877 $ 32,547    
Revised of the presentation of the December 30, 2017 balance sheet in this annual report on Form 10-K        
Deferred compensation and other non-current liabilities 7,957 11,526    
Deferred rent and facility-related non-current liabilities 23,618 20,656    
Adjustments in disclosure of accounts receivable and unbilled services presented on the December 30, 2017 and December 31, 2016 consolidated balance sheet        
Allowance netted against accounts receivable 3,764 5,252 $ 3,454  
Accounts receivable, net of allowance 94,525 79,803    
Increases to reserves 3,675 5,447    
Allowance netted against unbilled service 415 704 474  
Unbilled services, net of allowance 36,060 33,530    
Increases to reserves 4,755 2,459    
Classification changes within the operating activities portion of the December 30, 2017 and December 31, 2016 consolidated statements of cash flows        
Accounts receivable allowances (1,410) 1,739 535  
Accounts receivable (14,427) (13,032) (8,670)  
Net cash provided by operating activities $ 36,189 45,858 48,163  
As previously reported        
Revised of the presentation of the December 30, 2017 balance sheet in this annual report on Form 10-K        
Deferred compensation and other non-current liabilities   20,656    
Deferred rent and facility-related non-current liabilities   11,526    
Adjustments in disclosure of accounts receivable and unbilled services presented on the December 30, 2017 and December 31, 2016 consolidated balance sheet        
Allowance netted against accounts receivable   7,378 4,253  
Accounts receivable, net of allowance   79,803    
Increases to reserves   6,774    
Allowance netted against unbilled service   1,746 1,720  
Unbilled services, net of allowance   33,530    
Increases to reserves   2,255    
Classification changes within the operating activities portion of the December 30, 2017 and December 31, 2016 consolidated statements of cash flows        
Accounts receivable allowances   3,065 666  
Accounts receivable   (14,358) (8,801)  
Net cash provided by operating activities   $ 45,858 $ 48,163  
Net effect        
Correction        
Non-current liabilities       $ 0
Total liabilities       $ 0