Stock-Based Compensation (Summary of Stock Option Activity) (Details)	9 Months Ended
	Apr. 30, 2020 $ / shares shares
Options Outstanding
Beginning balance (in shares) | shares	6,531,250
Options granted (in shares) | shares	929,941
Options exercised (in shares) | shares	(667,564)
Options canceled (in shares) | shares	(79,279)
Ending balance (in shares) | shares	6,714,348
Weighted Average Exercise Price
Beginning balance (in usd per share) | $ / shares	$ 39.66
Granted (in usd per share) | $ / shares	51.96
Exercised (in usd per share) | $ / shares	29.79
Canceled (in usd per share) | $ / shares	52.37
Ending balance (in usd per share) | $ / shares	$ 42.19