Components of Inventory (Detail) (USD $) In Thousands, unless otherwise specified	Jul. 31, 2013	Jul. 31, 2012
Inventory [Line Items]
Raw materials	$ 78,679	$ 73,657
Work-in-process	11,862	9,994
Finished goods	25,739	25,293
Total inventory	$ 116,280	$ 108,944