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Inventories - Schedule of Inventories, Net of Reserves (Detail) - USD ($)
$ in Millions
Apr. 30, 2019
Oct. 31, 2018
Inventory Disclosure [Abstract]    
Chassis $ 46.9 $ 53.3
Raw materials 205.4 188.4
Work in process 201.5 195.7
Finished products 94.3 91.6
Inventory, Gross, Total 548.1 529.0
Less: reserves (11.8) (15.0)
Total inventories, net $ 536.3 $ 514.0