COMMON STOCK (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jul. 31, 2013	Jul. 31, 2012	Jul. 31, 2011
Stock Repurchase Program [Roll Forward]
Amount available for repurchases as of July 31, 2012	$ 331,873
New authorizations	250,000
Utilized	(250,000)	(121,164)	(149,907)
Amount available for repurchases as of July 31, 2013	331,873	331,873
Oct 16 2008 [Member]
Stock Repurchase Program [Roll Forward]
Amount available for repurchases as of July 31, 2012	81,873
New authorizations	0
Utilized	(81,873)
Amount available for repurchases as of July 31, 2013	0
Sep 26 2011 [Member]
Stock Repurchase Program [Roll Forward]
Amount available for repurchases as of July 31, 2012	250,000
New authorizations	0
Utilized	(168,127)
Amount available for repurchases as of July 31, 2013	81,873
Jan 17 2013 [Member]
Stock Repurchase Program [Roll Forward]
Amount available for repurchases as of July 31, 2012	0
New authorizations	250,000
Utilized	0
Amount available for repurchases as of July 31, 2013	$ 250,000