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Schedule of Major Classifications of Inventories (Detail) (USD $) In Thousands, unless otherwise specified | Jul. 31, 2013 | Jul. 31, 2012
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Schedule of Inventory [Line Items] |  |
Finished products | $ 9,888 | $ 16,570
Work in process | 36,188 | 59,803
Raw materials | 99,154 | 104,446
Chassis | 34,108 | 39,044
Subtotal | 179,338 | 219,863
Excess of FIFO costs over LIFO costs | (26,302) | (33,780)
Total inventories | $ 153,036 | $ 186,083

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