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Derivative Instruments - Fair Values of Derivative Instruments (Detail) - Designated as Hedging Instrument - USD ($)
$ in Millions
May 31, 2025
Aug. 31, 2024
Derivatives Fair Value [Line Items]    
Asset Derivatives $ 20.8 $ 24.0
Derivative Asset, Statement of Financial Position [Extensible Enumeration] Accounts Receivable, after Allowance for Credit Loss Accounts Receivable, after Allowance for Credit Loss
Liability Derivatives $ 0.5 $ 1.4
Derivative Liability, Statement of Financial Position [Extensible Enumeration] Accounts Payable and Accrued Liabilities Accounts Payable and Accrued Liabilities
Foreign Exchange Contracts    
Derivatives Fair Value [Line Items]    
Asset Derivatives $ 3.2 $ 4.3
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
Interest rate swap contracts    
Derivatives Fair Value [Line Items]    
Asset Derivatives $ 17.6 $ 19.7
Derivative Asset, Statement of Financial Position [Extensible Enumeration] Accounts Receivable, after Allowance for Credit Loss Accounts Receivable, after Allowance for Credit Loss
Liability Derivatives $ 0.4 $ 1.3
Derivative Liability, Statement of Financial Position [Extensible Enumeration] Accounts Payable and Accrued Liabilities Accounts Payable and Accrued Liabilities