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Derivative Instruments - Effects of Cash Flow Hedges Included in Statements of Income (Detail) - USD ($)
$ in Millions
 12 Months Ended
Aug. 31, 2025
Aug. 31, 2024
Aug. 31, 2023
Derivative [Line Items]      
Revenue $ 3,240.2 $ 3,544.7 $ 3,944.0
Cost of revenue 2,632.7 2,986.2 3,502.9
Interest and foreign exchange 75.7 100.8 85.4
Cash Flow Hedging      
Derivative [Line Items]      
Gain (loss) reclassified from AOCL 16.8 18.7 12.8
Cash Flow Hedging | Sales | Foreign Exchange Contracts      
Derivative [Line Items]      
Gain (loss) reclassified from AOCL 3.9 2.5 (0.2)
Gain (loss) amount excluded from effectiveness testing 3.1 2.5 2.0
Cash Flow Hedging | Cost of Sales | Foreign Exchange Contracts      
Derivative [Line Items]      
Gain (loss) reclassified from AOCL 0.1 (0.5) 2.2
Gain (loss) amount excluded from effectiveness testing 0.0 0.9 0.6
Cash Flow Hedging | Interest and Foreign Exchange | Interest Rate Swap Contracts      
Derivative [Line Items]      
Gain (loss) reclassified from AOCL $ 12.8 $ 16.7 $ 10.8