Accounting For Stock-Based Option Activity (Summary Of Stock Option Activity) (Details) (USD $)	3 Months Ended
	Oct. 31, 2012
Accounting For Stock-Based Compenstation [Abstract]
Options Outstanding, Beginning	8,056,327
Options Outstanding, Granted	53,423
Options Outstanding, Exercised	(795,437)
Options Outstanding, Canceled	(8,498)
Options Outstanding, Ending	7,305,815
Weighted Average Exercise Price, Outstanding, Beginning	$ 20.97
Weighted Average Exercise Price, Granted	$ 35.50
Weighted Average Exercise Price, Exercised	$ 14.50
Weighted Average Exercise Price, Canceled	$ 31.09
Weighted Average Exercise Price, Outstanding, Ending	$ 21.77