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Income Taxes (Details) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Aug. 31, 2021
Aug. 31, 2020
May 31, 2020
Aug. 31, 2021
Aug. 31, 2020
Feb. 28, 2018
Income Tax Contingency [Line Items]            
One time tax charge required due to Tax Act           $ 17,900,000
Income tax expense $ 12,700,000 $ 9,257,000   $ 17,670,000 $ 2,340,000 $ 9,400,000
Income tax expense (benefit) as a percent of income before income taxes 19.80% 9.60%   14.00% 1.60%  
U S tax liability for income generated in Macau $ 0     $ 0    
COVID-19            
Income Tax Contingency [Line Items]            
One-time income tax benefit, CARES Act     $ 9,400,000