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Stock-Based Compensation - Narrative (Details) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jan. 31, 2020 USD ($) $ / shares shares	Jan. 31, 2019 USD ($)	Jan. 31, 2020 USD ($) vote $ / shares shares	Jan. 31, 2019 USD ($) shares	Jul. 31, 2019 USD ($) shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for issuance (in shares) | shares	25,100,000		25,100,000
Shares available for grant (in shares) | shares	20,600,000		20,600,000
Exercised, aggregate intrinsic value			$ 62,182
Granted (in shares) | shares			150,000
Vesting of early exercised common stock options	$ 131	$ 277	$ 262	$ 567
Outstanding notes receivable, carrying amount		1,900		1,900
Interest receivable		200		200
Unrecognized compensation cost	239,700		$ 239,700
Unrecognized compensation cost, weighted-average			2 years 10 months 24 days
Capitalized stock-based compensation	$ 2,000		$ 1,200
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercised, aggregate intrinsic value			$ 62,200	$ 129,600
Weighted average grant date fair value (in dollars per share) | $ / shares			$ 22.76
Granted (in shares) | shares				0
Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period			4 years
Performance stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance shares outstanding (in shares) | shares	400,000		400,000
Employee Stock | 2018 Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for issuance (in shares) | shares	4,700,000		4,700,000
Shares available for grant (in shares) | shares	3,300,000		3,300,000
Duration of offering period			24 months
Number of purchases periods | vote			4
Duration of purchase periods			6 months
Shares issued (in shares) | shares	300,000
Average purchase price per share (in dollars per share) | $ / shares	$ 18.80		$ 18.80
Cash proceeds from the issuance of common stock			$ 5,300
Accrued compensation	$ 2,600		$ 2,600		$ 2,100
Vesting one year from vesting commencing date | Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting rights, percentage			25.00%
Additional Paid-In Capital
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting of early exercised common stock options	$ 131	$ 277	$ 262	$ 567
Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock subject to repurchase (in shares) | shares	63,000		63,000		122,000
Shares subject to repurchase, value	$ 300		$ 300		$ 600

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Aggregate carrying value as of the balance sheet date of the liabilities for stock option plans and other equity-based compensation arrangements payable within one year (or the operating cycle, if longer).

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