Long-Term Obligations - Schedule of Borrowings on Revolving Loan Agreement (Details) (USD $) In Thousands, unless otherwise specified	Jul. 31, 2013	Jul. 31, 2012
Line of Credit Facility [Line Items]
Notes payable	$ 50,613	$ 0
Weighted average borrowing rate	1.2423%
USD-Denominated Borrowing Credit Revolver [Member]
Line of Credit Facility [Line Items]
Notes Payable	39,000
Interest rate	1.2787%
USD-denominated credit facility China [Member]
Line of Credit Facility [Line Items]
Notes Payable	$ 11,613
Interest rate	1.1201%