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Inventories - Schedule of Major Classifications of Inventories (Detail) - USD ($)
$ in Thousands
Oct. 31, 2019
Jul. 31, 2019
Inventory [Line Items]    
Work in process $ 124,479 $ 126,636
Raw materials 301,469 300,721
Chassis 211,034 155,099
Subtotal 961,029 873,532
Excess of FIFO costs over LIFO costs (45,544) (45,544)
Total inventories, net 915,485 827,988
Recreational vehicles    
Inventory [Line Items]    
Finished products 267,200 230,483
Other    
Inventory [Line Items]    
Finished products $ 56,847 $ 60,593