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(Additional Information) (Details) - USD ($)
$ in Millions
Aug. 31, 2019
Aug. 31, 2018
Debt Disclosure [Abstract]    
Letters of credit and surety bonds $ 119.1  
Unused letters of credit $ 74.7  
Senior Notes | 4.900% Senior Notes    
Debt Instrument [Line Items]    
Senior Notes, stated interest rate 4.90%  
Senior Notes | 5.625% Senior Notes    
Debt Instrument [Line Items]    
Senior Notes, stated interest rate 5.625%  
Senior Notes | 4.700% Senior Notes    
Debt Instrument [Line Items]    
Senior Notes, stated interest rate 4.70%  
Senior Notes | 3.950% Senior Notes    
Debt Instrument [Line Items]    
Senior Notes, stated interest rate 3.95% 3.95%