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Inventories - Components of Inventories (Detail) - USD ($)
$ in Millions
May 31, 2023
Aug. 31, 2022
Inventory Disclosure [Abstract]    
Manufacturing supplies and raw materials $ 710.6 $ 570.2
Work-in-process 108.4 183.3
Finished goods 85.0 75.9
Excess and obsolete adjustment (16.0) (14.1)
Inventories $ 888.0 $ 815.3