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Acquisitions (Narrative) (Details)
£ in Millions
1 Months Ended 12 Months Ended
May 01, 2017
USD ($)
Apr. 06, 2017
GBP (£)
Oct. 31, 2017
USD ($)
Dec. 27, 2019
USD ($)
Dec. 28, 2018
USD ($)
Dec. 29, 2017
USD ($)
Apr. 06, 2017
USD ($)
Business Acquisition [Line Items]              
Purchase consideration       $ 1,010,000   $ 11,268,000  
Total share based compensation       7,716,000 $ 9,310,000 10,316,000  
Jibe Consulting, Inc [Member]              
Business Acquisition [Line Items]              
Effective date of acquisition May 01, 2017            
Purchase consideration $ 5,400,000            
Purchase consideration, common stock $ 3,600,000            
Common stock vesting period 4 years            
Contingent consideration performance period 18 months            
Total share based compensation       $ 600,000 $ 900,000    
Contributed total revenue           12,300,000  
Contribution before depreciation, amortization, interest, corporate overhead allocation and taxes           1,200,000  
Acquisition related costs           200,000  
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 $ 700,000            
Jibe Consulting, Inc [Member] | Stock Based Contingent Consideration [Member]              
Business Acquisition [Line Items]              
Contingent consideration $ 1,000,000            
Aecus Limited [Member]              
Business Acquisition [Line Items]              
Effective date of acquisition   Apr. 06, 2017          
Purchase consideration | £   £ 3.2          
Contingent consideration             $ 0
Contributed total revenue           3,900,000  
Contribution before depreciation, amortization, interest, corporate overhead allocation and taxes           500,000  
Acquisition related costs           $ 100,000  
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          
The Chartered Institute of Management Accountants [Member]              
Business Acquisition [Line Items]              
Purchase consideration     $ 2,000,000        
Amortization period     4 years