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Acquisitions (Narrative) (Details)
$ in Thousands, £ in Millions
3 Months Ended 5 Months Ended 9 Months Ended
May 01, 2017
USD ($)
Apr. 06, 2017
GBP (£)
Sep. 30, 2017
USD ($)
Sep. 29, 2017
USD ($)
Sep. 29, 2017
USD ($)
Sep. 30, 2016
USD ($)
Business Acquisition [Line Items]            
Purchase consideration         $ 9,268  
Non-cash stock compensation expense         7,588 $ 6,467
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          
Vesting period 4 years          
Contingent consideration $ 11,000          
Contingent consideration performance period 18 months          
Non-cash stock compensation expense         1,000  
Preliminary purchase price allocation evaluation period from acquisition date 12 months          
Contributed total revenue       $ 7,600    
Contribution before depreciation, amortization, interest, corporate overhead allocation and taxes       700    
Acquisition related costs       200    
Jibe Consulting, Inc [Member] | Minimum            
Business Acquisition [Line Items]            
Amortization period 2 years          
Jibe Consulting, Inc [Member] | Maximum            
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         900  
Preliminary purchase price allocation evaluation period from acquisition date   12 months        
Contributed total revenue       2,600    
Contribution before depreciation, amortization, interest, corporate overhead allocation and taxes       $ 500    
Acquisition related costs         $ 100  
Acquired percentage   100.00%        
Aecus Limited [Member] | Minimum            
Business Acquisition [Line Items]            
Amortization period   2 years        
Aecus Limited [Member] | Maximum            
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] | Subsequent Event [Member]            
Business Acquisition [Line Items]            
Purchase consideration     $ 2,000