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Income Taxes (Tables)
9 Months Ended
May 31, 2021
Income Tax Disclosure [Abstract]  
Summary of U.S. Federal Statutory Income Tax Rate Compared to Actual Income Tax Expense The U.S. federal statutory income tax rate and the Company's effective income tax rate are as follows:
Three months ended Nine months ended
May 31, 2021 May 31, 2020 May 31, 2021 May 31, 2020
U.S. federal statutory income tax rate 21.0  % 21.0  % 21.0  % 21.0  %
Effective income tax rate 20.3  % 465.0  % 26.0  % 108.3  %