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Components of Inventory (Detail) (USD $)	Apr. 30, 2015	Jul. 31, 2014
Inventory [Line Items]
Raw materials	$ 70,900,000	$ 59,600,000
Work in process	51,300,000	41,200,000
Finished goods	23,100,000	24,000,000
Total inventory	$ 145,251,000us-gaap_InventoryNet	$ 124,777,000us-gaap_InventoryNet

Carrying amount, net of reserves and adjustments, as of the balance sheet date of merchandise or goods which are partially completed. This inventory is generally comprised of raw materials, labor and factory overhead costs, which require further materials, labor and overhead to be converted into finished goods, and which generally require the use of estimates to determine percentage complete and pricing.

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