Stock-Based Compensation (Summary of Stock Option Activity) (Details)	9 Months Ended
	Apr. 30, 2019 $ / shares shares
Options Outstanding
Beginning balance (in shares) | shares	6,785,812
Options granted (in shares) | shares	908,925
Options exercised (in shares) | shares	(1,059,460)
Options canceled (in shares) | shares	(56,350)
Ending balance (in shares) | shares	6,578,927
Weighted Average Exercise Price
Beginning balance (in usd per share) | $ / shares	$ 34.93
Granted (in usd per share) | $ / shares	58.02
Exercised (in usd per share) | $ / shares	25.02
Canceled (in usd per share) | $ / shares	50.79
Ending balance (in usd per share) | $ / shares	$ 39.57