Notes Payable Notes Payable - Schedule of Borrowings (Details) (USD $) In Thousands, unless otherwise specified	Apr. 30, 2014	Jul. 31, 2013
Short-term Debt [Line Items]
Short-term Debt, Weighted Average Interest Rate	1.3992%
Notes payable	$ 75,552	$ 50,613
USD-denominated credit facility China [Member]
Short-term Debt [Line Items]
Short-term Debt, Weighted Average Interest Rate	1.5518%
Notes payable	12,552	11,613
USD-Denominated Borrowing Credit Revolver [Member]
Short-term Debt [Line Items]
Short-term Debt, Weighted Average Interest Rate	1.2465%
Notes payable	$ 63,000	$ 39,000