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Income Taxes (Tables)
3 Months Ended
Nov. 30, 2019
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,
2019
 
November 30,
2018
U.S. federal statutory income tax rate
21.0
%
 
21.0
%
Effective income tax rate
60.3
%
 
24.8
%