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Stock-Based Compensation - Additional Information (Details) - USD ($) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 31, 2015 | Jan. 31, 2016 | Jan. 31, 2015 | Jan. 31, 2014
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Liabilities related to early exercises of stock options | $ 286,000 | $ 11,000 | $ 286,000 |
Unvested shares subject to repurchase | 113,541 | 9,375 | 113,541 |
Aggregate intrinsic value of exercised options |  | $ 24,800,000 | $ 27,500,000 | $ 17,800,000
Aggregate estimated fair value of stock options granted to employees vested |  | $ 16,700,000 | $ 16,400,000 | $ 7,400,000
Weighted-average grant date fair value of options granted to employees |  | $ 6.72 | $ 7.46 | $ 4.75
Unrecognized stock-based compensation expense related to stock option |  | $ 29,200,000 |  |
Remaining weighted-average period |  | 2 years 5 months 1 day |  |
Restricted Stock Units |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Remaining weighted-average period |  | 3 years 15 days |  |
Unrecognized stock-based compensation expense |  | $ 111,000,000 |  |
Unvested shares outstanding | 4,939,709 | 8,204,968 | 4,939,709 | 225,300
Restricted Stock Awards |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Remaining weighted-average period |  | 8 months 16 days |  |
Unrecognized stock-based compensation expense |  | $ 123,000 |  |
Unvested shares outstanding | 172,661 | 30,607 | 172,661 | 387,435
Employee Stock Option |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Dividend yield |  | 0.00% | 0.00% | 0.00%
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 | 12,200,000 | 13,777,992 | 12,200,000 |
Shares common stock, increase | 12,200,000 |  |  |
Shares common stock, outstanding shares of capital stock | 5.00% |  |  |
2015 Employee Stock Purchase Plan |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Shares common stock reserved for issuance |  | 2,761,742 |  |
Percentage of eligible compensation allowed to employees to purchase shares at a discount |  | 15.00% |  |
Description of offering period excluding initial offering period |  | Except for the initial offering period, our 2015 ESPP provides for 24-month offering periods beginning March 16 and September 16 of each year, and each offering period will consist of four six-month purchase periods. |  |
Purchase price of common stock, percentage |  | 85.00% |  |
Remaining weighted-average period |  | 1 year 7 months 13 days |  |
Unrecognized stock-based compensation expense |  | $ 11,800,000 |  |
2015 Employee Stock Purchase Plan | Restricted Stock Awards |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Remaining weighted-average period |  | 1 year 7 months 13 days |  |
Unrecognized stock-based compensation expense |  | $ 2,200,000 |  |
Issuance of common stock in connection with acquisition (in shares) |  |  | 344,667 |
Weighted average grant date fair value, 2015 acquisition |  |  | $ 12.96 |
Unvested shares outstanding |  | 267,717 |  |
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 |  | 2,500,000 |  |
Shares common stock, increase |  | 2,500,000 |  |
Shares common stock, outstanding shares of capital stock |  | 1.00% |  |
Other Employee Stock Purchase Plan |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Shares common stock reserved for issuance |  | 71,037 |  |
Remaining weighted-average period |  | 1 year 4 months 28 days |  |
Unrecognized stock-based compensation expense |  | $ 700,000 |  |
Unvested shares outstanding |  | 65,705 |  |
Vesting Commencement Per Year | 2015 Equity Incentive Plan |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Options and restricted stock units vesting percentage |  | 25.00% |  |
Vesting Commencement Per Month |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Options and restricted stock units vesting percentage |  | 2.08% |  |
Vesting Commencement Per Quarter |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Options and restricted stock units vesting percentage |  | 6.25% |  |

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