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Business Acquisitions (Details) - USD ($)
$ in Thousands
Jan. 31, 2017
Dec. 30, 2017
Dec. 31, 2016
Jan. 02, 2016
Assets Acquired:        
Goodwill   $ 89,000 $ 74,764 $ 76,970
C1 Consulting LLC        
Business Acquisitions        
Maximum period for additional purchase consideration to be paid 4 years      
Assets Acquired:        
Accounts receivable and unbilled receivables $ 2,306      
Other current assets 10      
Total current assets 2,316      
Property and equipment 206      
Other non-current assets 106      
Intangible assets 8,500      
Goodwill 12,994      
Total assets acquired 24,122      
Liabilities Assumed:        
Deferred revenue 1,950      
Accrued expenses and other current liabilities 652      
Total current liabilities 2,602      
Contingent consideration 2,357      
Total liabilities assumed 4,959      
Net assets acquired $ 19,163      
C1 Consulting LLC | Selling, general and administrative expenses        
Liabilities Assumed:        
Transaction related costs   $ 900    
C1 Consulting LLC | Non-competition agreements        
Liabilities Assumed:        
Estimated useful life (in years) 5 years      
C1 Consulting LLC | Customer relationships        
Liabilities Assumed:        
Estimated useful life (in years) 10 years