Stockholders' Equity - Additional Information (Details)	9 Months Ended
	Apr. 30, 2021 USD ($) Vote Class $ / shares shares	Apr. 30, 2020 USD ($)	Aug. 31, 2020 USD ($)	Jul. 31, 2020 $ / shares shares
Class of Stock [Line Items]
Common stock, number of classes of stock | Class	2
Common stock, shares authorized (in shares)	1,200,000,000			1,200,000,000
Common stock, par value (in dollars per share) | $ / shares	$ 0.000025			$ 0.000025
Common stock, shares issued (in shares)	211,531,000			201,949,000
Common stock, shares outstanding (in shares)	211,531,000			201,949,000
Repurchase and retirement of common stock (in shares)	5,200,000
Payments for repurchase of common stock | $	$ 125,079,000
Stock repurchase program, remaining authorization amount | $	$ 0
Common Class A
Class of Stock [Line Items]
Common stock, shares authorized (in shares)	1,000,000,000			1,000,000,000
Common stock, par value (in dollars per share) | $ / shares	$ 0.000025			$ 0.000025
Common stock, shares issued (in shares)	202,186,000			186,846,000
Common stock, shares outstanding (in shares)	202,186,000			186,846,000
Common stock number of votes per share | Vote	1
Stock repurchase program, authorized amount | $			$ 125,000,000.0
Stock repurchase price (in dollars per share) | $ / shares	$ 24.15
Payments for repurchase of common stock | $	$ 125,000,000.0
Common Class B
Class of Stock [Line Items]
Common stock, shares authorized (in shares)	200,000,000			200,000,000
Common stock, par value (in dollars per share) | $ / shares	$ 0.000025			$ 0.000025
Common stock, shares issued (in shares)	9,345,000			15,103,000
Common stock, shares outstanding (in shares)	9,345,000			15,103,000
Common stock number of votes per share | Vote	10