Accounting For Stock-Based Compensation (Summary Of Stock Option Activity) (Details) (USD $)	9 Months Ended
	Apr. 30, 2014	Jan. 31, 2014
Accounting For Stock-Based Compensation [Abstract]
Options Outstanding, Beginning Balance	7,329,820	7,276,418
Options Outstanding, Granted	891,737
Options Outstanding, Exercised	(930,225)
Options Outstanding, Canceled	(14,914)
Options Outstanding, Ending Balance	7,276,418	7,276,418
Weighted Average Exercise Price, Beginning Balance	$ 23.88
Weighted Average Exercise Price, Granted	$ 42.18
Weighted Average Exercise Price, Exercised	$ 18.63
Weighted Average Exercise Price, Canceled	$ 35.59
Weighted Average Exercise Price, Ending Balance	$ 26.76