Components of Inventory (Detail) (USD $)	Jan. 31, 2014	Jul. 31, 2013
Inventory [Line Items]
Raw materials	$ 59,500,000	$ 78,700,000
Work in process	32,200,000	11,900,000
Finished goods	21,200,000	25,700,000
Total inventory	$ 112,936,000	$ 116,280,000