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Inventories - Schedule of Major Classifications of Inventories (Detail) - USD ($)
$ in Thousands
Oct. 31, 2020
Jul. 31, 2020
Inventory [Line Items]    
Work in process $ 209,155 $ 128,181
Raw materials 387,516 302,813
Chassis 334,392 135,194
Subtotal 1,086,209 763,264
Excess of FIFO costs over LIFO costs (47,959) (46,959)
Total inventories, net 1,038,250 716,305
Recreational vehicles    
Inventory [Line Items]    
Finished products 108,327 152,297
Other    
Inventory [Line Items]    
Finished products $ 46,819 $ 44,779