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Acquisition (Purchase Price Allocation) (Details)
£ in Thousands, $ in Thousands
May 01, 2017
USD ($)
Apr. 06, 2017
GBP (£)
Dec. 29, 2017
USD ($)
Dec. 30, 2016
USD ($)
Jan. 01, 2016
USD ($)
Business Acquisition [Line Items]          
Goodwill | $     $ 85,074 $ 72,376 $ 74,584
Jibe Consulting, Inc [Member]          
Business Acquisition [Line Items]          
Total consideration | $ $ 11,293        
Accounts receivable | $ 1,932        
Other current assets | $ 59        
Total current assets acquired | $ 1,991        
Intangible assets | $ 931        
Goodwill | $ 9,538        
Total assets acquired | $ 12,460        
Accrued expenses and other liabilities | $ 1,167        
Total liabilities acquired | $ 1,167        
Purchase consideration on acquisition | $ $ 11,293        
Aecus Limited [Member]          
Business Acquisition [Line Items]          
Total consideration | £   £ 3,173      
Cash | £   209      
Accounts receivable | £   898      
Other current assets | £   46      
Total current assets acquired | £   1,153      
Intangible assets | £   1,515      
Goodwill | £   1,306      
Total assets acquired | £   3,974      
Accrued expenses and other liabilities | £   801      
Total liabilities acquired | £   801      
Purchase consideration on acquisition | £   £ 3,173