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Inventories - Components of Inventories (Detail) - USD ($)
$ in Millions
Aug. 31, 2023
Aug. 31, 2022
Inventory Disclosure [Abstract]    
Manufacturing supplies and raw materials $ 638.2 $ 570.2
Work-in-process 138.2 183.3
Finished goods 64.4 75.9
Excess and obsolete adjustment (17.2) (14.1)
Inventories $ 823.6 $ 815.3