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Acquisitions (Narrative) (Details)
$ in Thousands, £ in Millions
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
May 01, 2017
USD ($)
Apr. 06, 2017
GBP (£)
Oct. 31, 2017
USD ($)
Sep. 28, 2018
USD ($)
Sep. 28, 2018
GBP (£)
Mar. 30, 2018
GBP (£)
Sep. 28, 2018
USD ($)
Sep. 28, 2018
GBP (£)
Sep. 29, 2017
USD ($)
Dec. 29, 2017
USD ($)
Business Acquisition [Line Items]                    
Purchase consideration                 $ 9,268  
Non-cash stock compensation expense             $ 6,932   $ 7,588  
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                  
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] | Cost of Sales [Member]                    
Business Acquisition [Line Items]                    
Non-cash stock compensation expense       $ 200     (100)      
Jibe Consulting, Inc [Member] | Selling Shareholder's [Member]                    
Business Acquisition [Line Items]                    
Cash compensation benefit (expense)       (800)     3,800      
Jibe Consulting, Inc [Member] | Key Employees [Member]                    
Business Acquisition [Line Items]                    
Cash compensation benefit (expense)       $ (100)     $ 100      
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                
Contributed total revenue                   3,900
Contribution before depreciation, amortization, interest, corporate overhead allocation and taxes                   500
Acquisition related costs                   $ 100
Acquired percentage   100.00%                
Cash and non-cash compensation benefit (expense) | £           £ 0.5        
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]                    
Business Acquisition [Line Items]                    
Cash compensation benefit (expense) | £         £ (0.1)     £ 0.3    
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     4 years