Stock Based Compensation (Summary Of Stock Option Activity) (Details)	6 Months Ended
	Jan. 31, 2018 $ / shares shares
Options Outstanding
Beginning balance (in shares) | shares	6,685,551
Options granted (in shares) | shares	877,050
Options exercised (in shares) | shares	(530,916)
Options canceled (in shares) | shares	(21,193)
Ending balnace (in shares) | shares	7,010,492
Weighted Average Exercise Price
Weighted Average Exercise Price, Beginning Balance (in usd per share) | $ / shares	$ 32.60
Weighted Average Exercise Price, Granted (in usd per share) | $ / shares	45.69
Weighted Average Exercise Price, Exercised (in usd per share) | $ / shares	26.32
Weighted Average Exercise Price, Canceled (in usd per share) | $ / shares	37.60
Weighted Average Exercise Price, Ending Balance (in usd per share) | $ / shares	$ 34.70