OTHER CURRENT AND NON-CURRENT ASSETS (Details 4) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jul. 31, 2014	Jul. 31, 2013	Jul. 31, 2012
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Proceeds from sales	$ 22,285	$ 15,018	$ 35,973
Realized gross gains on sales	245	427	9,828
Realized gross losses on sales	$ 179	$ 5	$ 55