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Income Taxes - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Feb. 28, 2018
Feb. 28, 2018
Aug. 31, 2018
Income Tax Disclosure [Abstract]      
Tax Cuts and Jobs Act, provisional income tax expense $ 30.9 $ 30.9  
Subsequent Event [Line Items]      
U.S. federal statutory rate 25.70%    
Reduction in unrecognized tax benefits for the period $ 16.1 $ 16.1  
Scenario, Forecast      
Subsequent Event [Line Items]      
U.S. federal statutory rate     25.70%