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Product Warranties - Product Warranty Activities (Parenthetical) (Detail) - USD ($)
$ in Millions
Sep. 30, 2021
Sep. 30, 2020
Other Current Liabilities [Member]    
Product Warranty Liability [Line Items]    
Short-term product warranties $ 21.7 $ 13.0
Other Noncurrent Liabilities [Member]    
Product Warranty Liability [Line Items]    
Long-term product warranties $ 1.1 $ 3.1