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Schedule of Major Classifications of Inventories (Detail) - USD ($)
$ in Thousands
Jul. 31, 2019
Jul. 31, 2018
Inventory [Line Items]    
Work in process $ 126,636 $ 124,703
Raw materials 300,721 258,429
Chassis 155,099 116,308
Subtotal 873,532 579,758
Excess of FIFO costs over LIFO costs (45,544) (41,849)
Total inventories, net 827,988 537,909
Recreational vehicles    
Inventory [Line Items]    
Finished products 230,483 44,998
Other    
Inventory [Line Items]    
Finished products $ 60,593 $ 35,320