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Income Taxes (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
May 31, 2021
May 31, 2020
May 31, 2021
May 31, 2020
Income Taxes [Abstract]        
Income tax benefit $ (10,149) $ 10,220 $ (9,605) $ 7,985
Pre-tax loss $ 2,605 $ (748) 2,211 $ (2,430)
Tax benefit from decrease in valuation allowance against deferred income tax assets     10,900  
Income tax benefit upon exercise of the options     $ 500  
Percentage of net tax benefit     434.00%