Accounting For Stock-Based Compensation (Summary Of Stock Option Activity) (Details)	3 Months Ended
	Oct. 31, 2015 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Options Outstanding, Beginning Balance (in shares)	7,191,442
Options Outstanding, Granted (in shares)	0
Options Outstanding, Exercised (in shares)	(85,599)
Options Outstanding, Canceled (in shares)	(128,356)
Options Outstanding, Ending Balance (in shares)	6,977,487
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Weighted Average Exercise Price, Beginning Balance (in usd per share) | $ / shares	$ 29.38
Weighted Average Exercise Price, Granted (in usd per share) | $ / shares	0.00
Weighted Average Exercise Price, Exercised (in usd per share) | $ / shares	18.89
Weighted Average Exercise Price, Canceled (in usd per share) | $ / shares	37.77
Weighted Average Exercise Price, Ending Balance (in usd per share) | $ / shares	$ 29.36