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Stock-Based Compensation - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Oct. 31, 2019 | Oct. 31, 2018 | Oct. 31, 2019 | Oct. 31, 2018 | Apr. 30, 2019 | Jan. 31, 2019 | Jan. 31, 2015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Aggregate intrinsic value of exercised options |  |  | $ 4,500 | $ 27,500 |  |  |
Aggregate estimated fair value of stock options granted to employees vested |  |  | $ 2,400 | $ 5,600 |  |  |
Weighted-average grant date fair value of options granted to employees |  |  | $ 8.00 | $ 8.24 |  |  |
Unrecognized stock-based compensation expense related to stock option | $ 6,800 |  | $ 6,800 |  |  |  |
Remaining weighted-average period |  |  | 2 years 5 months 8 days |  |  |  |
Stock options outstanding | 9,195,826 |  | 9,195,826 |  |  | 9,096,961 |
Unrecognized stock-based compensation expense | $ 3,300 |  | $ 3,300 |  | $ 7,200 |  |
Share-based compensation expense | 37,758 | $ 31,790 | $ 106,925 | $ 89,086 |  |  |
Common Stock, trading day |  |  | On June 14, 2018, all of our outstanding shares of Class B common stock automatically converted into the same number of shares of Class A common stock pursuant to the terms of our Amended and Restated Certificate of Incorporation. No additional shares of Class B common stock will be issued following such conversion. The conversion occurred pursuant to Article IV of the Amended and Restated Certificate of Incorporation, which provided that each one share of Class B common stock would convert automatically, without any further action, into one share of Class A common stock on the first trading day falling on or after the date on which the outstanding shares of Class B common stock represent less than 5% of the aggregate number of shares of the then outstanding Class A common stock and Class B common stock. |  |  |  |
Employee Stock Option |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Dividend yield |  | 0.00% | 0.00% | 0.00% |  |  |
Restricted Stock Units |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Remaining weighted-average period |  |  | 2 years 10 months 2 days |  |  |  |
Unrecognized stock-based compensation expense | 304,600 |  | $ 304,600 |  |  |  |
Performance-Based Stock Options |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Unrecognized stock-based compensation expense related to stock option | $ 4,000 |  | $ 4,000 |  |  |  |
Remaining weighted-average period |  |  | 3 years 3 days |  |  |  |
2015 Equity Incentive Plan | Performance-Based Stock Options |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Stock options outstanding | 1,375,000 |  | 1,375,000 |  |  |  |
2015 Equity Incentive Plan | Time-Based Stock Options |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Vesting period |  |  | 4 years |  |  |  |
2015 Equity Incentive Plan | Class A Common Stock |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Shares common stock reserved for issuance | 19,337,104 |  | 19,337,104 |  |  |  | 12,200,000
2015 Employee Stock Purchase Plan |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Percentage of eligible compensation allowed to employees to purchase shares at a discount | 15.00% |  | 15.00% |  |  |  |
Description of offering period excluding initial offering period |  |  | The 2015 ESPP provides for 24-month offering periods beginning March 16 and September 16 of each year, and each offering period consists of four six-month purchase periods. |  |  |  |
Purchase price of common stock, percentage |  |  | 85.00% |  |  |  |
Description of offering period resets |  |  | the offering period resets and the new lower price becomes the new offering price for a new 24 month offering period. |  |  |  |
Unrecognized stock-based compensation expense | $ 21,100 |  | $ 21,100 |  |  |  |
Dividend yield | 0.00% | 0.00% | 0.00% | 0.00% |  |  |
2015 Employee Stock Purchase Plan | Class A Common Stock |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Shares common stock reserved for issuance | 1,926,616 |  | 1,926,616 |  |  |  | 2,500,000
Fiscal 2020 Executive Bonus Plan |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Description of offering period resets |  |  | certain offering periods reset and the new lower price became the new offering price for a new 24 month offering period |  |  |  |
Unrecognized stock-based compensation expense | $ 1,800 |  | $ 1,800 |  |  |  |
Equity incentive compensation description |  |  | The Fiscal 2020 Executive Bonus Plan provides opportunities for 100% equity incentive compensation payouts based on our actual achievement of pre-established corporate financial objectives, subject to review and a final approval by our Compensation Committee. |  |  |  |
Share-based compensation expense |  |  | $ 2,700 |  |  |  |
Fiscal 2020 Executive Bonus Plan | Maximum |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Remaining weighted-average period |  |  | 1 year |  |  |  |
Fiscal 2020 Executive Bonus Plan | Class A Common Stock |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Common Stock, trading day |  |  | The number of restricted stock units each participant will receive is equal to the dollar value of his or her actual award payment divided by the average closing price of a share of our Class A common stock for the 30-trading day period ending the last trading date before the grant date |  |  |  |
One Year from Vesting Commencement Date | 2015 Equity Incentive Plan | Employee Stock Option |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Vesting percentage |  |  | 25.00% |  |  |  |
One Year from Vesting Commencement Date | 2015 Equity Incentive Plan | Restricted Stock Units |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Vesting percentage |  |  | 25.00% |  |  |  |
One Year from Vesting Commencement Date | 2015 Equity Incentive Plan | Time-Based Stock Options |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Vesting percentage |  |  | 25.00% |  |  |  |
Per Month after One Year of Vesting Commencement Date | 2015 Equity Incentive Plan | Employee Stock Option |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Vesting percentage |  |  | 2.08% |  |  |  |
Per Month after One Year of Vesting Commencement Date | 2015 Equity Incentive Plan | Time-Based Stock Options |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Vesting percentage |  |  | 2.08% |  |  |  |
Per Quarter after One Year Of Vesting Commencement Date | 2015 Equity Incentive Plan | Restricted Stock Units |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Vesting percentage |  |  | 6.25% |  |  |  |

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