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Components of Inventory (Detail) (USD $)
Oct. 31, 2014
Jul. 31, 2014
Inventory [Line Items]    
Raw materials $ 64,700,000 $ 59,600,000
Work in process 45,600,000 41,200,000
Finished goods 26,300,000 24,000,000
Total inventory $ 136,570,000 $ 124,777,000