Shareholders' Equity (Schedule Of Treasury Stock) (Details) - shares	12 Months Ended
	Jul. 31, 2018	Jul. 31, 2017	Jul. 31, 2016
Schedule of Treasury Shares Activity [Roll Forward]
Beginning balance (in shares)	21,037,353
Net issuance upon exercise of stock options (in shares)	(738,635)	(978,193)	(916,789)
Ending balance (in shares)	22,871,145	21,037,353
Treasury Stock
Schedule of Treasury Shares Activity [Roll Forward]
Beginning balance (in shares)	21,037,353	18,750,503
Stock repurchases (in shares)	2,642,690	3,330,357
Net issuance upon exercise of stock options (in shares)	(723,677)	(944,556)
Issuance under compensation plans (in shares)	(78,304)	(91,817)
Other activity (in shares)	(6,917)	(7,134)
Ending balance (in shares)	22,871,145	21,037,353	18,750,503