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Derivative Instruments - Fair Values of Derivative Instruments (Detail) - USD ($)
$ in Millions
May 31, 2023
Aug. 31, 2022
Designated as Hedging Instrument    
Derivatives Fair Value [Line Items]    
Asset Derivatives $ 29.4 $ 21.4
Derivative Asset, Statement of Financial Position [Extensible Enumeration] Accounts Receivable, after Allowance for Credit Loss Accounts Receivable, after Allowance for Credit Loss
Liability Derivatives $ 0.0 $ 2.9
Derivative Liability, Statement of Financial Position [Extensible Enumeration] Accounts Payable and Accrued Liabilities Accounts Payable and Accrued Liabilities
Designated as Hedging Instrument | Foreign Exchange Contracts    
Derivatives Fair Value [Line Items]    
Asset Derivatives $ 3.5 $ 0.6
Derivative Asset, Statement of Financial Position [Extensible Enumeration] Accounts Receivable, after Allowance for Credit Loss Accounts Receivable, after Allowance for Credit Loss
Liability Derivatives $ 0.0 $ 2.9
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 $ 25.9 $ 20.8
Derivative Asset, Statement of Financial Position [Extensible Enumeration] Accounts Receivable, after Allowance for Credit Loss Accounts Receivable, after Allowance for Credit Loss
Not Designated as Hedging Instrument | Foreign Exchange Contracts    
Derivatives Fair Value [Line Items]    
Asset Derivatives $ 0.4  
Derivative Asset, Statement of Financial Position [Extensible Enumeration] Accounts Receivable, after Allowance for Credit Loss  
Liability Derivatives   $ 0.1
Derivative Liability, Statement of Financial Position [Extensible Enumeration]   Accounts Payable and Accrued Liabilities