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Acquisition (Narrative) (Details)
$ in Thousands, £ in Millions
1 Months Ended 8 Months Ended 9 Months Ended 12 Months Ended
May 01, 2017
USD ($)
Apr. 06, 2017
GBP (£)
Oct. 31, 2017
USD ($)
Dec. 29, 2017
USD ($)
Dec. 29, 2017
USD ($)
Dec. 29, 2017
USD ($)
Dec. 30, 2016
USD ($)
Jan. 01, 2016
USD ($)
Business Acquisition [Line Items]                
Purchase consideration           $ 11,268    
Non-cash stock compensation expense           10,316 $ 8,765 $ 10,361
Jibe Consulting, Inc [Member]                
Business Acquisition [Line Items]                
Effective date of acquisition May 01, 2017              
Purchase consideration $ 5,400              
Purchase consideration, common stock $ 3,600              
Common stock vesting period 4 years              
Contingent consideration $ 11,000              
Contingent consideration performance period 18 months              
Non-cash stock compensation expense           1,500    
Purchase price allocation evaluation period from acquisition date 12 months              
Contributed total revenue       $ 12,300        
Contribution before depreciation, amortization, interest, corporate overhead allocation and taxes       $ 1,200        
Acquisition related costs           200    
Jibe Consulting, Inc [Member] | Minimum [Member]                
Business Acquisition [Line Items]                
Amortization period 2 years              
Jibe Consulting, Inc [Member] | Maximum [Member]                
Business Acquisition [Line Items]                
Amortization period 5 years              
Jibe Consulting, Inc [Member] | Cash Contingent Consideration [Member]                
Business Acquisition [Line Items]                
Contingent consideration $ 6,600              
Jibe Consulting, Inc [Member] | Stock Based Contingent Consideration [Member]                
Business Acquisition [Line Items]                
Contingent consideration $ 4,400              
Aecus Limited [Member]                
Business Acquisition [Line Items]                
Effective date of acquisition   Apr. 06, 2017            
Purchase consideration | £   £ 3.2            
Contingent consideration performance period   12 months            
Non-cash stock compensation expense           1,300    
Purchase price allocation evaluation period from acquisition date   12 months            
Contributed total revenue         $ 3,900      
Contribution before depreciation, amortization, interest, corporate overhead allocation and taxes         $ 500      
Acquisition related costs           $ 100    
Acquired percentage   100.00%            
Aecus Limited [Member] | Minimum [Member]                
Business Acquisition [Line Items]                
Amortization period   2 years            
Aecus Limited [Member] | Maximum [Member]                
Business Acquisition [Line Items]                
Amortization period   5 years            
Aecus Limited [Member] | Cash Contingent Consideration [Member] | Sellers [Member]                
Business Acquisition [Line Items]                
Contingent consideration | £   £ 2.4            
Aecus Limited [Member] | Cash Contingent Consideration [Member] | Key Personnel [Member]                
Business Acquisition [Line Items]                
Contingent consideration | £   0.3            
Aecus Limited [Member] | Stock Based Contingent Consideration [Member] | Key Personnel [Member]                
Business Acquisition [Line Items]                
Contingent consideration | £   £ 0.3            
The Chartered Institute of Management Accountants [Member]                
Business Acquisition [Line Items]                
Purchase consideration     $ 2,000          
Amortization period     10 years