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Stock-Based Compensation - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Apr. 30, 2020 | Apr. 30, 2019 | Jan. 31, 2020 | Jan. 31, 2015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Aggregate intrinsic value of exercised options | $ 2,200 | $ 1,900 |  |
Aggregate estimated fair value of stock options granted to employees vested | $ 500 | $ 900 |  |
Weighted-average grant date fair value of options granted to employees | $ 5.41 | $ 8.00 |  |
Unrecognized stock-based compensation expense related to stock option | $ 4,300 |  |  |
Remaining weighted-average period | 1 year 11 months 23 days |  |  |
Stock options outstanding | 8,557,575 |  | 8,772,585 |
Unrecognized stock-based compensation expense | $ 3,900 |  |  |
Share-based compensation expense | $ 40,043 | $ 32,362 |  |
Restricted Stock Units |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Remaining weighted-average period | 2 years 10 months 20 days |  |  |
Unrecognized stock-based compensation expense | $ 321,900 |  |  |
Performance-Based Stock Options |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Unrecognized stock-based compensation expense related to stock option | $ 2,300 |  |  |
Remaining weighted-average period | 2 years 6 months 7 days |  |  |
Employee Stock Option |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Dividend yield | 0.00% |  |  |
2015 Equity Incentive Plan | Restricted Stock Units |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Vesting period | 4 years |  |  |
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 |  |  |
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 | 21,767,691 |  |  | 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% |  |  |
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 | $ 17,300 |  |  |
Dividend yield | 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 | 2,151,229 |  |  | 2,500,000
Fiscal 2020 Executive Bonus Plan |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Share-based compensation expense | $ 1,500 |  |  |
Fiscal 2021 Executive Bonus Plan |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Unrecognized stock-based compensation expense | 10,900 |  |  |
Share-based compensation expense | $ 2,800 |  |  |
Equity incentive compensation description | The Fiscal 2021 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. |  |  |
Fiscal 2021 Executive Bonus Plan | Maximum |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Remaining weighted-average period | 1 year |  |  |
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 | Restricted Stock Units |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Vesting percentage | 6.25% |  |  |
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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