Shareholders' Equity (Schedule Of Treasury Stock) (Details) - shares	12 Months Ended
	Jul. 31, 2017	Jul. 31, 2016	Jul. 31, 2015
Schedule of Treasury Shares Activity [Roll Forward]
Beginning balance (in shares)	18,750,503
Net issuance upon exercise of stock options (in shares)	(978,193)	(916,789)	(916,566)
Ending balance (in shares)	21,037,353	18,750,503
Treasury Stock
Schedule of Treasury Shares Activity [Roll Forward]
Beginning balance (in shares)	18,750,503	17,044,950
Stock repurchases (in shares)	3,330,357	2,540,000
Net issuance upon exercise of stock options (in shares)	(944,556)	(764,756)
Issuance under compensation plans (in shares)	(91,817)	(59,787)
Other activity (in shares)	(7,134)	(9,904)
Ending balance (in shares)	21,037,353	18,750,503	17,044,950