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Inventories - Schedule of Major Classifications of Inventories (Detail) - USD ($)
$ in Thousands
Jan. 31, 2022
Jul. 31, 2021
Inventory [Line Items]    
Work in process $ 412,536 $ 376,594
Raw materials 770,650 602,106
Chassis 349,954 292,921
Subtotal 1,766,819 1,444,274
Excess of FIFO costs over LIFO costs (87,740) (74,890)
Total inventories, net 1,679,079 1,369,384
Recreational vehicles    
Inventory [Line Items]    
Finished products 121,798 114,843
Other    
Inventory [Line Items]    
Finished products $ 111,881 $ 57,810