Accounting For Stock-Based Option Activity (Summary Of Stock Option Activity) (Details) (USD $)	6 Months Ended
	Jan. 31, 2013
Accounting For Stock-Based Compenstation [Abstract]
Options Outstanding, Beginning	8,056,327
Options Outstanding, Granted	910,442
Options Outstanding, Exercised	(1,148,958)
Options Outstanding, Canceled	(66,727)
Options Outstanding, Ending	7,751,084
Weighted Average Exercise Price, Outstanding, Beginning	$ 20.97
Weighted Average Exercise Price, Granted	$ 33.77
Weighted Average Exercise Price, Exercised	$ 14.00
Weighted Average Exercise Price, Canceled	$ 34.20
Weighted Average Exercise Price, Outstanding, Ending	$ 23.39