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Segment Information (Reconciliation Of Adjusted EBITDA) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
May 31, 2021
Feb. 28, 2021
Nov. 30, 2020
May 31, 2020
May 31, 2021
May 31, 2020
Segment Reporting Information [Line Items]            
Consolidated Adjusted EBITDA $ 8,563     $ (3,642) $ 17,402 $ 5,375
Stock-based compensation (2,370)     5,104 (5,127) 1,460
Buiness acquisition costs (300)       (300)  
Decrease (increase) in the fair value of contingent consideration liabilities (118) $ 16 $ (62) 276 (164) 367
Government COVID-19 assistance         234  
Knowledge Capital wind-down costs           (389)
Gain from insurance settlement       933 150 933
Depreciation (1,423)     (1,652) (4,904) (4,925)
Amortization (1,238)     (1,164) (3,503) (3,504)
Income (loss) from operations 3,114     (145) 3,788 (683)
Interest income 16     18 56 36
Interest expense (525)     (621) (1,633) (1,783)
Income (loss) before income taxes 2,605     (748) 2,211 (2,430)
Income tax benefit (provision) 10,149     (10,220) 9,605 (7,985)
Net income (loss) 12,754     (10,968) 11,816 (10,415)
Operating Segments [Member]            
Segment Reporting Information [Line Items]            
Consolidated Adjusted EBITDA 10,847     (1,908) 23,327 9,785
Corporate And Eliminations [Member]            
Segment Reporting Information [Line Items]            
Consolidated Adjusted EBITDA $ (2,284)     $ (1,734) $ (5,925) $ (4,410)