Shareholders' Equity (Schedule Of Treasury Stock) (Details) - shares	12 Months Ended
	Jul. 31, 2015	Jul. 31, 2014	Jul. 31, 2013
Equity, Class of Treasury Stock [Line Items]
Beginning balance	11,237,522
Net issuance upon exercise of stock options	(916,566)	(1,008,848)	(1,607,081)
Ending balance	17,044,950	11,237,522
Treasury Stock [Member]
Equity, Class of Treasury Stock [Line Items]
Beginning balance	11,237,522	5,490,725
Stock repurchases	6,675,147	6,795,545
Net issuance upon exercise of stock options	(773,385)	(863,249)
Issuance under compensation plans	(85,611)	(175,160)
Other activity	(8,723)	(10,339)
Ending balance	17,044,950	11,237,522	5,490,725