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Income Taxes (Details) - USD ($)
 3 Months Ended 12 Months Ended
May 31, 2021
May 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 (benefit) $ 4,970,000 $ (6,917,000) $ 9,400,000
Income tax expense (benefit) as a percent of income before income taxes 8.00% (13.00%)  
U S tax liability for income generated in Macau $ 0    
COVID-19      
Income Tax Contingency [Line Items]      
One-time income tax benefit, CARES Act   $ 9,400,000