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Derivative Instruments - Effects of Cash Flow Hedges Included in Statements of Income (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
May 31, 2025
May 31, 2024
May 31, 2025
May 31, 2024
Derivative [Line Items]        
Revenue $ 842.7 $ 820.2 $ 2,480.7 $ 2,491.7
Cost of revenue 691.2 696.4 2,017.0 2,124.4
Interest and foreign exchange 13.2 24.7 58.3 72.5
Sales        
Derivative [Line Items]        
Amount of gain (loss) on cash flow hedge activity 1.5 0.9 3.1 1.9
Cost of Sales        
Derivative [Line Items]        
Amount of gain (loss) on cash flow hedge activity 0.0 0.2 (0.1) 0.1
Interest and Foreign Exchange        
Derivative [Line Items]        
Amount of gain (loss) on cash flow hedge activity $ 2.8 $ 4.3 $ 9.9 $ 12.8