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Derivative Instruments - Fair Values of Derivative Instruments (Detail) - USD ($)
$ in Millions
May 31, 2024
Aug. 31, 2023
Designated as Hedging Instrument    
Derivatives Fair Value [Line Items]    
Asset Derivatives $ 40.2 $ 37.4
Derivative Asset, Statement of Financial Position [Extensible Enumeration] Accounts Receivable, after Allowance for Credit Loss Accounts Receivable, after Allowance for Credit Loss
Liability Derivatives $ 0.2 $ 0.2
Derivative Liability, Statement of Financial Position [Extensible Enumeration] Accounts Payable and Accrued Liabilities  
Designated as Hedging Instrument | Foreign Exchange Contracts    
Derivatives Fair Value [Line Items]    
Asset Derivatives $ 5.4 $ 2.5
Derivative Asset, Statement of Financial Position [Extensible Enumeration] Accounts Receivable, after Allowance for Credit Loss Accounts Receivable, after Allowance for Credit Loss
Liability Derivatives $ 0.1 $ 0.1
Derivative Liability, Statement of Financial Position [Extensible Enumeration] Accounts Payable and Accrued Liabilities Accounts Payable and Accrued Liabilities
Designated as Hedging Instrument | Interest rate swap contracts    
Derivatives Fair Value [Line Items]    
Asset Derivatives $ 34.8 $ 34.9
Derivative Asset, Statement of Financial Position [Extensible Enumeration] Accounts Receivable, after Allowance for Credit Loss Accounts Receivable, after Allowance for Credit Loss
Liability Derivatives $ 0.1 $ 0.1
Derivative Liability, Statement of Financial Position [Extensible Enumeration]   Accounts Payable and Accrued Liabilities
Not Designated as Hedging Instrument | Foreign Exchange Contracts    
Derivatives Fair Value [Line Items]    
Asset Derivatives $ 0.2 $ 0.5
Derivative Asset, Statement of Financial Position [Extensible Enumeration]   Accounts Receivable, after Allowance for Credit Loss
Derivative Liability, Statement of Financial Position [Extensible Enumeration]   Accounts Payable and Accrued Liabilities