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Schedule of Major Classifications of Inventories (Detail) - USD ($)
$ in Thousands
Oct. 31, 2018
Jul. 31, 2018
Inventory [Line Items]    
Work in process $ 120,844 $ 124,703
Raw materials 262,318 258,429
Chassis 106,684 116,308
Subtotal 608,895 579,758
Excess of FIFO costs over LIFO costs (43,549) (41,849)
Total inventories, net 565,346 537,909
Recreational vehicles    
Inventory [Line Items]    
Finished products 92,990 44,998
Other    
Inventory [Line Items]    
Finished products $ 26,059 $ 35,320