Stock Based Compensation (Summary Of Stock Option Activity) (Details)	3 Months Ended
	Oct. 31, 2018 $ / shares shares
Options Outstanding
Beginning balance (in shares) | shares	6,785,812
Options granted (in shares) | shares	841,725
Options exercised (in shares) | shares	(743,708)
Options canceled (in shares) | shares	(14,732)
Ending balnace (in shares) | shares	6,869,097
Weighted Average Exercise Price
Weighted Average Exercise Price, Beginning Balance (in usd per share) | $ / shares	$ 34.93
Weighted Average Exercise Price, Granted (in usd per share) | $ / shares	59.18
Weighted Average Exercise Price, Exercised (in usd per share) | $ / shares	24.24
Weighted Average Exercise Price, Canceled (in usd per share) | $ / shares	44.19
Weighted Average Exercise Price, Ending Balance (in usd per share) | $ / shares	$ 39.03