OTHER CURRENT AND NON-CURRENT ASSETS (Details 4) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jul. 31, 2013	Jul. 31, 2012	Jul. 31, 2011
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Proceeds from sales	$ 15,018	$ 35,973	$ 26,941
Realized gross gains on sales	427	9,828	949
Realized gross losses on sales	$ 5	$ 55	$ 21