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Inventories - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	Jul. 31, 2013	Jul. 31, 2012
Schedule of Inventory [Line Items]
Inventory	$ 179,338	$ 219,863
Subsidiaries valued inventory in first-in, first-out method	15,335	36,887
Inventory obsolescence reserve	$ 2,393	$ 1,866

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The amount of FIFO (first in first out) inventory present at the reporting date when inventory is also valued using different valuation methods.

+ References

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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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The amount of the valuation account as of the balance sheet date which reduces the carrying amount of inventory to net realizable value; takes into consideration such factors as market value, excessive quantities based on expected sales, technological obsolescence, and shrinkage. May also provide for estimated product returns or price concessions pertaining to product cost.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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