Long-Term Obligations - Schedule of Borrowings on Revolving Loan Agreement (Details) (USD $) In Thousands, unless otherwise specified	Jul. 31, 2014	Jul. 31, 2013
Line of Credit Facility [Line Items]
Notes payable	$ 61,422	$ 50,613
Weighted average borrowing rate	2.0311%	1.2423%
USD-Denominated Borrowing Credit Revolver [Member]
Line of Credit Facility [Line Items]
Interest rate	1.2472%	1.2787%
Notes payable	42,000	39,000
USD-Denominated Borrowings [Member] | USD-denominated credit facility China [Member]
Line of Credit Facility [Line Items]
Interest rate	1.3548%	1.1201%
Notes payable	6,923	11,613
CNY-Denominated Borrowings [Member] [Member] | USD-denominated credit facility China [Member]
Line of Credit Facility [Line Items]
Interest rate	5.04%
Notes payable	$ 12,499