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INVENTORIES - Schedule of Major Classifications of Inventories (Detail) - USD ($)
$ in Thousands
Jul. 31, 2020
Jul. 31, 2019
Inventory [Line Items]    
Work in process $ 128,181 $ 126,636
Raw materials 302,813 300,721
Chassis 135,194 155,099
Subtotal 763,264 873,532
Excess of FIFO costs over LIFO costs (46,959) (45,544)
Inventories, net 716,305 827,988
Recreational vehicles    
Inventory [Line Items]    
Finished goods 152,297 230,483
Other    
Inventory [Line Items]    
Finished goods $ 44,779 $ 60,593