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Inventories - Schedule of Major Classifications of Inventories (Detail) - USD ($)
$ in Thousands
Apr. 30, 2020
Jul. 31, 2019
Inventory [Line Items]    
Work in process $ 124,072 $ 126,636
Raw materials 309,136 300,721
Chassis 200,148 155,099
Subtotal 914,191 873,532
Excess of FIFO costs over LIFO costs (46,544) (45,544)
Total inventories, net 867,647 827,988
Recreational vehicles    
Inventory [Line Items]    
Finished products 219,892 230,483
Other    
Inventory [Line Items]    
Finished products $ 60,943 $ 60,593