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Inventories - Schedule of Major Classifications of Inventories (Detail) - USD ($)
$ in Thousands
Oct. 31, 2021
Jul. 31, 2021
Inventory [Line Items]    
Work in process $ 432,513 $ 376,594
Raw materials 706,689 602,106
Chassis 392,575 292,921
Subtotal 1,750,087 1,444,274
Excess of FIFO costs over LIFO costs (78,240) (74,890)
Total inventories, net 1,671,847 1,369,384
Recreational vehicles    
Inventory [Line Items]    
Finished products 124,858 114,843
Other    
Inventory [Line Items]    
Finished products $ 93,452 $ 57,810