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Inventories - Schedule of Inventories, Net of Reserves (Detail) - USD ($)
$ in Millions
Oct. 31, 2018
Oct. 31, 2017
Inventory Disclosure [Abstract]    
Chassis $ 53.3 $ 54.7
Raw materials 188.4 162.5
Work in process 195.7 180.1
Finished products 91.6 68.4
Inventory, Gross, Total 529.0 465.7
Less: reserves (15.0) (13.3)
Total inventories, net $ 514.0 $ 452.4