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Postretirement and Other Employee Benefits (Additional Information) (Details) - USD ($)
$ in Millions
12 Months Ended
Aug. 31, 2019
Aug. 31, 2018
Aug. 31, 2017
Pension and Other Postretirement Benefits Disclosure [Line Items]      
Company contributions $ 49.0 $ 40.5 $ 33.6
Minimum      
Pension and Other Postretirement Benefits Disclosure [Line Items]      
Contributions expected to funded pension plans during fiscal year 2018 0.4    
Maximum      
Pension and Other Postretirement Benefits Disclosure [Line Items]      
Contributions expected to funded pension plans during fiscal year 2018 $ 0.6    
Global equity securities      
Pension and Other Postretirement Benefits Disclosure [Line Items]      
Target allocation percentage 35.00%    
Debt securities      
Pension and Other Postretirement Benefits Disclosure [Line Items]      
Target allocation percentage 65.00%    
Foreign Plan      
Pension and Other Postretirement Benefits Disclosure [Line Items]      
Service period 3 years