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Correction (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 29, 2018
Sep. 30, 2017
Mar. 31, 2018
Dec. 30, 2017
Correction        
Non-current liabilities $ 37,014     $ 32,547
Deferred compensation and other non-current liabilities 13,034     11,526
Deferred rent and facility-related non-current liabilities 23,703     20,656
Allowance netted against accounts receivable 5,440     5,252
Accounts receivable, net of allowance 88,270     79,803
Allowance netted against unbilled service 1,427     865
Unbilled services, net of allowance 43,303     33,530
Accounts receivable allowance 884 $ 1,746    
Accounts receivable (9,391) (10,180)    
Net cash provided by operating activities $ (8,394) 7,791    
As previously reported        
Correction        
Deferred compensation and other non-current liabilities       20,656
Deferred rent and facility-related non-current liabilities       11,526
Allowance netted against accounts receivable       7,378
Accounts receivable, net of allowance       79,803
Allowance netted against unbilled service       1,746
Unbilled services, net of allowance       $ 33,530
Accounts receivable allowance   3,166    
Accounts receivable   (11,600)    
Net cash provided by operating activities   $ 7,791    
Net effect        
Correction        
Non-current liabilities     $ 0  
Total liabilities     $ 0