FINANCIAL INSTRUMENTS AND RISKS AND UNCERTAINTIES (Details) (USD $) In Thousands	Jul. 31, 2011	Jul. 31, 2010
Other Assets Current [Member]
Derivatives not designated as hedging instruments
Foreign exchange forward contracts	$ 1,456	$ 2,166
Total derivatives		2,166
Other Current Liabilities [Member]
Derivatives not designated as hedging instruments
Foreign exchange forward contracts	478	555
Total derivatives		555
Long-term Debt [Member]
Nonderivative instruments designated as hedging instruments
Net investment hedge	$ 115,803	$ 104,166