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Schedule of Major Classifications of Inventories (Detail) (USD $) In Thousands, unless otherwise specified | Jul. 31, 2014 | Jul. 31, 2013
--- | --- | ---
Inventory [Line Items] |  |
Finished products | $ 27,424 | $ 9,888
Work in process | 49,537 | 36,188
Raw materials | 122,150 | 99,154
Chassis | 45,231 | 34,108
Subtotal | 244,342 | 179,338
Excess of FIFO costs over LIFO costs | (27,988) | (26,302)
Total inventories | $ 216,354 | $ 153,036

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