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Business Acquisitions (Narrative) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Apr. 26, 2021
Dec. 05, 2018
Aug. 31, 2021
Dec. 31, 2020
Aug. 31, 2020
Aug. 31, 2019
Business Acquisition, Contingent Consideration [Line Items]            
Selling, general, and administrative     $ 144,988   $ 129,979 $ 140,530
Revenue     224,168   198,456 225,356
Income (loss) from operations     8,101   $ 3,058 $ 2,655
Strive [Member]            
Business Acquisition, Contingent Consideration [Line Items]            
Aggregate consideration $ 14,320          
Purchase price paid in cash 10,554          
Amount in escrow 1,000          
Payable in equal cash payments on the first five anniversaries $ 4,200          
Accrues interest, percent 3.60%          
Payments to stockholders and option holders $ 1,000          
Revenue       $ 1,300    
Income (loss) from operations       $ (1,100)    
Acquisition costs     300      
Strive [Member] | Maximum [Member]            
Business Acquisition, Contingent Consideration [Line Items]            
Aggregate consideration 20,000          
Earned by the former principal owner 4,200          
Additional contingent payments $ 5,200          
Germany, Switzerland, And Austria Licensee [Member]            
Business Acquisition, Contingent Consideration [Line Items]            
Aggregate consideration   $ 957        
Purchase price paid in cash   159        
Amount in forgiveness of liabilities owed   798        
Selling, general, and administrative     $ 500      
Former GSA Licensee [Member]            
Business Acquisition, Contingent Consideration [Line Items]            
Purchase price paid in cash   200        
Amount in forgiveness of liabilities owed   $ 800