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Schedule of Major Classifications of Inventories (Detail) - USD ($)
$ in Thousands
Jan. 31, 2019
Jul. 31, 2018
Inventory [Line Items]    
Work in process $ 118,361 $ 124,703
Raw materials 245,197 258,429
Chassis 107,969 116,308
Subtotal 607,091 579,758
Excess of FIFO costs over LIFO costs (45,249) (41,849)
Total inventories, net 561,842 537,909
Recreational vehicles    
Inventory [Line Items]    
Finished products 106,225 44,998
Other    
Inventory [Line Items]    
Finished products $ 29,339 $ 35,320