TREASURY STOCK (Detail Textuals) (USD $) In Thousands, except Per Share data, unless otherwise specified	9 Months Ended	12 Months Ended
	Apr. 30, 2013	Jul. 31, 2012
Stock Repurchase Program [Roll Forward]
Amount available for repurchases (beginning balance)	$ 331,873	$ 331,873
New authorizations	250,000
Utilized	(250,000)
Amount available for repurchases (ending balance)	331,873	331,873
Total number of shares repurchased (in shares)	3,971
Average price per share to repurchase shares (in dollars per share)	$ 62.95
Shares issued for stock plans	1,214
Treasury stock, shares	16,527
October 16, 2008 Authorization [Member]
Stock Repurchase Program [Roll Forward]
Amount available for repurchases (beginning balance)	0	81,873
New authorizations	0
Utilized	(81,873)
Amount available for repurchases (ending balance)	0	81,873
September 26, 2011 Authorization [Member]
Stock Repurchase Program [Roll Forward]
Amount available for repurchases (beginning balance)	81,873	250,000
New authorizations	0
Utilized	(168,127)
Amount available for repurchases (ending balance)	81,873	250,000
January 17, 2013 Authorization [Member]
Stock Repurchase Program [Roll Forward]
Amount available for repurchases (beginning balance)	250,000	0
New authorizations	250,000
Utilized	0
Amount available for repurchases (ending balance)	$ 250,000	$ 0