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Inventories - Schedule of Inventories, Net of Reserves (Detail) - USD ($)
$ in Millions
Jul. 31, 2019
Oct. 31, 2018
Inventory Disclosure [Abstract]    
Chassis $ 46.8 $ 53.3
Raw materials 220.3 188.4
Work in process 202.5 195.7
Finished products 100.1 91.6
Inventory, Gross, Total 569.7 529.0
Less: reserves (11.8) (15.0)
Total inventories, net $ 557.9 $ 514.0