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Income Taxes (Tables)
3 Months Ended
Nov. 30, 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
November 30, 2021 November 30, 2020
U.S. federal statutory income tax rate 21.0  % 21.0  %
Effective income tax rate 23.9  % 29.6  %