Accounting for Stock-Based Compensation (Summary Of Stock Option Activity) (Details)	6 Months Ended
	Jan. 31, 2016 $ / shares shares
Options Outstanding
Options Outstanding, Beginning Balance (in shares) | shares	7,191,442
Options Outstanding, Granted (in shares) | shares	941,350
Options Outstanding, Exercised (in shares) | shares	(361,571)
Options Outstanding, Canceled (in shares) | shares	(153,525)
Options Outstanding, Ending Balance (in shares) | shares	7,617,696
Weighted Average Exercise Price
Weighted Average Exercise Price, Beginning Balance (in usd per share) | $ / shares	$ 29.38
Weighted Average Exercise Price, Granted (in usd per share) | $ / shares	28.07
Weighted Average Exercise Price, Exercised (in usd per share) | $ / shares	17.35
Weighted Average Exercise Price, Canceled (in usd per share) | $ / shares	37.82
Weighted Average Exercise Price, Ending Balance (in usd per share) | $ / shares	$ 29.62