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INVENTORIES - Schedule of Major Classifications of Inventories (Detail) - USD ($)
$ in Thousands
Jul. 31, 2021
Jul. 31, 2020
Inventory [Line Items]    
Work in process $ 376,594 $ 128,181
Raw materials 602,106 302,813
Chassis 292,921 135,194
Subtotal 1,444,274 763,264
Excess of FIFO costs over LIFO costs (74,890) (46,959)
Inventories, net 1,369,384 716,305
Recreational vehicles    
Inventory [Line Items]    
Finished goods 114,843 152,297
Other    
Inventory [Line Items]    
Finished goods $ 57,810 $ 44,779