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Fair Value Measures - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($)
$ in Millions
Nov. 30, 2023
Aug. 31, 2023
Assets:    
Nonqualified savings plan investments $ 48.4 $ 47.7
Fair Value, Measurements, Recurring    
Assets:    
Derivative financial instruments 38.5 37.9
Nonqualified savings plan investments 48.4 47.7
Cash equivalents 51.6 51.2
Assets, Fair Value Disclosure, Total 138.5 136.8
Liabilities:    
Derivative financial instruments 0.1 0.2
Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring    
Assets:    
Nonqualified savings plan investments 48.4 47.7
Cash equivalents 51.6 51.2
Assets, Fair Value Disclosure, Total 100.0 98.9
Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring    
Assets:    
Derivative financial instruments [1] 38.5 37.9
Assets, Fair Value Disclosure, Total [1] 38.5 37.9
Liabilities:    
Derivative financial instruments [1] $ 0.1 $ 0.2
[1] Level 2 assets and liabilities include derivative financial instruments that are valued based on observable inputs. See Note 11 - Derivative Instruments for further discussion.