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Stock-Based Compensation (Tables) | 9 Months Ended
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Apr. 30, 2022
Share-based Payment Arrangement [Abstract] |
Summary of Stock Option Activity | Stock option activity under the 2011 Plan, 2017 Plan, and 2019 Plan is as follows:
|  |  |  | Options Outstanding
|  |  |  | Number of Options |  | Weighted- Average Exercise Price |  | Weighted- Average Remaining Contractual Life (in Years) |  | Aggregate Intrinsic Value (in thousands)
Balance – July 31, 2021 |  |  |  | 3,650,482 |  |  | $ | 25.47 |  |  | 7.40 |  | $ | 106,490 |
Granted |  |  |  | 1,201,877 |  |  | 14.54 |  |  |  |  |
Exercised |  |  |  | (171,996) |  |  | 8.95 |  |  |  |  |
Cancelled |  |  |  | (279,869) |  |  | 32.62 |  |  |  |  |
Balance – April 30, 2022 |  |  |  | 4,400,494 |  |  | $ | 22.67 |  |  | 7.52 |  | $ | 1,501 |
Schedule of Unvested Restricted Stock Units Activity | The following table summarizes the RSU award activity under the 2017 Plan and 2019 Plan:
| Unvested RSUs |  |  |  |
| Class A Common Stock |  | Weighted- Average Grant Date Fair Value |  |  |  |
Unvested at July 31, 2021 | 10,264,925 |  |  | $ | 31.35 |  |  |  |  |
Granted | 13,186,611 |  |  | 16.34 |  |  |  |  |
Vested | (2,344,882) |  |  | 27.57 |  |  |  |  |
Forfeited | (4,227,978) |  |  | 29.03 |  |  |  |  |
Unvested at April 30, 2022 | 16,878,676 |  |  | $ | 20.73 |  |  |  |  |
Summary of Assumptions Used in Black-Scholes Option-Pricing Model to Determine Fair Value of Stock Options | The fair value of stock options granted to employees was estimated at the grant date using the Black-Scholes option-pricing model with the following assumptions:
| For the Three Months Ended |  | For the Nine Months Ended
| April 30, 2022 |  | May 1, 2021 |  | April 30, 2022 |  | May 1, 2021
Expected term (in years) | 3.1 - 3.7 |  | 5.8 |  | 3.1 - 5.5 |  | 5.3 - 6.3
Volatility | 67.0% |  | 55.5% |  | 62.1% - 67.0% |  | 55.5% - 55.9%
Risk free interest rate | 1.4% - 1.5% |  | 0.6% |  | 0.8% -1.5% |  | 0.3% - 0.6%
Dividend yield | — | % |  | — | % |  | — | % |  | — | %

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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the change in restricted stock units (RSUs). + References No definition available. + Details
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