Stock-Based Compensation (Summary of Stock Option Activity) (Details)	6 Months Ended
	Jan. 31, 2021 $ / shares shares
Options Outstanding
Beginning balance (in shares) | shares	6,533,979
Options granted (in shares) | shares	998,131
Options exercised (in shares) | shares	(564,012)
Options canceled/forfeited (in shares) | shares	(23,049)
Ending balance (in shares) | shares	6,945,049
Weighted Average Exercise Price
Beginning balance (in usd per share) | $ / shares	$ 42.44
Granted (in usd per share) | $ / shares	46.52
Exercised (in usd per share) | $ / shares	34.40
Canceled/forfeited (in usd per share) | $ / shares	50.18
Ending balance (in usd per share) | $ / shares	$ 43.66