Notes Payable - Additional Information (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Apr. 30, 2014	Apr. 30, 2013	Jul. 31, 2013
Notes Payable [Line Items]
Notes payable	$ 75,552		$ 50,613
Repayments of Lines of Credit	2,401	0
Proceeds from borrowing on notes payable	63,000	220,000
USD-denominated credit facility China [Member]
Notes Payable [Line Items]
Notes payable	12,552		11,613
Repayments of Lines of Credit	2,401
Maximum Amount Outstanding	14,946
Remaining borrowing capacity	13,648
USD-Denominated Borrowing Credit Revolver [Member]
Notes Payable [Line Items]
Notes payable	63,000		39,000
Maximum Amount Outstanding	72,000
Remaining borrowing capacity	237,000
Maximum Borrowing Capacity	387,000
Proceeds from borrowing on notes payable	$ 63,000	$ 220,000