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Components of Inventory (Detail) (USD $)
Jul. 31, 2014
Jul. 31, 2013
Inventory [Line Items]    
Raw materials $ 59,600,000 $ 63,500,000
Work-in-process 41,200,000 27,100,000
Finished goods 24,000,000 25,700,000
Total Inventory $ 124,777,000 $ 116,280,000