Stock Option Plans (Summary Of Stock Option Activity) (Details) - $ / shares	12 Months Ended
	Jul. 31, 2015	Jul. 31, 2014	Jul. 31, 2013
Share-based Compensation [Abstract]
Options Outstanding, Beginning Balance	7,197,882	7,329,820	8,056,327
Options Outstanding, Granted	1,023,836	900,073	965,050
Options Outstanding, Exercised	(916,566)	(1,008,848)	(1,607,081)
Options Outstanding, Canceled	(113,710)	(23,163)	(84,476)
Options Outstanding, Ending Balance	7,191,442	7,197,882	7,329,820
Weighted Average Exercise Price, Beginning Balance	$ 26.84	$ 23.88	$ 20.97
Weighted Average Exercise Price, Granted	38.58	42.17	33.91
Weighted Average Exercise Price, Exercised	18.54	18.80	14.79
Weighted Average Exercise Price, Canceled	38.67	34.02	33.94
Weighted Average Exercise Price, Ending Balance	$ 29.38	$ 26.84	$ 23.88