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Income Taxes (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
May 31, 2019
May 31, 2018
Feb. 28, 2018
May 31, 2019
May 31, 2018
Aug. 31, 2018
Income Tax Disclosure [Abstract]            
Federal statutory rate         25.70% 25.70%
Tax Cuts And Jobs Act Of 2017 Incomplete Accounting Provisional Income Tax Expense Benefit     $ (7)      
Effective tax rate 26.00% 21.70%   22.80% 5.70%  
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount     $ (7)