Accounting For Stock-Based Compensation (Summary Of Stock Option Activity) (Details) (USD $)	9 Months Ended
	Apr. 30, 2012
Accounting For Stock-Based Compensation [Abstract]
Options Outstanding at July 31, 2011	8,387,994
Options Outstanding, Granted	1,074,909
Options Outstanding, Exercised	(1,281,456)
Options Outstanding, Canceled	(29,820)
Options Outstanding at April 30, 2012	8,151,627
Weighted Average Exercise Price, Outstanding at July 31, 2011	$ 17.72
Weighted Average Exercise Price, Granted	$ 34.77
Weighted Average Exercise Price, Exercised	$ 11.66
Weighted Average Exercise Price, Canceled	$ 26.91
Weighted Average Exercise Price, Outstanding at April 30, 2012	$ 20.89