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Stock-Based Compensation (Tables) | 12 Months Ended
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Aug. 03, 2019
Share-based Payment Arrangement [Abstract] |
Schedule of Shares Available For Grant | The following table summarizes the shares available for grant under the 2017 Plan:
|  | Shares Available for Grant
Balance – July 28, 2018 |  | 3,743,623 |
Authorized |  | — |
Granted |  | (4,113,084 | )
Cancelled |  | 1,502,719 |
Balance – August 3, 2019 |  | 1,133,258 |
Schedule of Stock Option Activity | Stock option activity under the 2011 Plan and 2017 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 28, 2018 |  | 9,052,160 |  |  | $ | 11.74 |  |  | 8.23 |  | $ | 160,856 |
Granted |  | 1,090,890 |  |  | 24.77 |  |  |  |  |
Exercised |  | (2,198,655 | ) |  | 6.79 |  |  |  |  |
Cancelled |  | (874,270 | ) |  | 16.15 |  |  |  |  |
Balance – August 3, 2019 |  | 7,070,125 |  |  | $ | 14.48 |  |  | 7.72 |  | $ | 73,861 |
Options vested and exercisable - August 3, 2019 |  | 2,263,236 |  |  | $ | 9.48 |  |  | 6.77 |  | $ | 35,009 |
Options vested and expected to vest - August 3, 2019 |  | 6,450,028 |  |  | $ | 14.40 |  |  | 7.61 |  | $ | 69,652 |
Summary of Restricted Stock Unit Award Activity | The following table summarizes the restricted stock unit (“RSU”) award activity under the 2017 Plan:
|  | Unvested RSUs
|  | Class A Common Stock |  | Weighted- Average Grant Date Fair Value
Unvested at July 28, 2018 |  | 2,432,326 |  |  | $ | 21.58 |
Granted |  | 3,022,194 |  |  | 30.25 |
Vested |  | (397,226 | ) |  | 20.67 |
Forfeited |  | (628,449 | ) |  | 23.50 |
Unvested at August 3, 2019 |  | 4,428,845 |  |  | $ | 27.30 |
Summary of Black - Scholes Option - Pricing Model Assumptions Used in Estimating 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 Fiscal Year Ended
|  | August 3, 2019 |  | July 28, 2018 |  | July 29, 2017
Expected term (in years) |  | 5.1 - 6.5 |  |  | 5.4 - 6.6 |  |  | 5.1 - 7.7 |
Volatility |  | 41.7 - 52.2% |  |  | 41.4 - 43.5% |  |  | 42.6 - 46.0% |
Risk free interest rate |  | 2.3 - 3.0% |  |  | 1.9 - 3.0% |  |  | 1.3 -2.3% |
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=116856206&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=116856206&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=116856206&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=116856206&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of number, weighted-average exercise price or conversion ratio, aggregate intrinsic value, and weighted-average remaining contractual term for outstanding and exercisable options that are fully vested and expected to vest. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + 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 (e) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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