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Fair Value Measures - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($)
$ in Millions
May 31, 2025
Aug. 31, 2024
Assets:    
Nonqualified savings plan investments $ 56.7 $ 54.5
Fair Value, Measurements, Recurring    
Assets:    
Derivative financial instruments 20.8 24.0
Nonqualified savings plan investments 56.7 54.5
Cash equivalents 127.2 195.3
Assets, Fair Value Disclosure, Total 204.7 273.8
Liabilities:    
Derivative financial instruments 0.5 1.4
Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring    
Assets:    
Nonqualified savings plan investments 56.7 54.5
Cash equivalents 127.2 195.3
Assets, Fair Value Disclosure, Total 183.9 249.8
Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring    
Assets:    
Derivative financial instruments [1] 20.8 24.0
Assets, Fair Value Disclosure, Total [1] 20.8 24.0
Liabilities:    
Derivative financial instruments [1] $ 0.5 $ 1.4
[1] Level 2 assets and liabilities include derivative financial instruments that are valued based on observable inputs. See Note 12 - Derivative Instruments to the Condensed Consolidated Financial Statements for further discussion.