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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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Carrying amount as of balance sheet date of major components of certain assembled products.

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- Definition

The excess of replacement or current cost over the stated LIFO (last in first out) inventory value when the LIFO inventory method is utilized.

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Amount before valuation and LIFO reserves of completed merchandise or goods expected to be sold within one year or operating cycle, if longer.

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Gross amount, as of the balance sheet date, of merchandise, goods, commodities, or supplies held for future sale or to be used in manufacturing, servicing or production process.

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Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.

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Amount before valuation and LIFO reserves of raw materials expected to be sold, or consumed within one year or operating cycle, if longer.

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Amount before valuation and LIFO reserves of merchandise or goods in the production process expected to be completed within one year or operating cycle, if longer.

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