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Warranties - Accrued Warranty Classified Consolidated Balance Sheets (Detail) - USD ($)
$ in Millions
Apr. 30, 2020
Oct. 31, 2019
Apr. 30, 2019
Oct. 31, 2018
Guarantees [Abstract]        
Current liabilities $ 20.8 $ 16.1    
Other long-term liabilities 11.6 6.5    
Total warranty liability $ 32.4 $ 22.6 $ 24.5 $ 30.8