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Employee Incentive Plans - Narrative (Details) $ / shares in Units, $ in Millions |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Feb. 17, 2017 USD ($) shares | Mar. 31, 2017 offering_period shares | Apr. 30, 2017 USD ($) equity_incentive_plan $ / shares shares | Apr. 30, 2016 USD ($) $ / shares | Jan. 31, 2017 USD ($) shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of equity incentive plans | equity_incentive_plan |  |  | 2 |  |
Options to purchase common stock outstanding (in shares) | shares |  |  | 33,939,472 |  | 32,866,862
Weighted average grant date fair value of options granted (in dollars per share) | $ / shares |  |  | $ 5.36 | $ 3.65 |
Grant date fair value of vested stock options |  |  | $ 4.6 | $ 2.7 |
Intrinsic value of options exercised |  |  | 14.1 | $ 0.3 |
Unrecognized stock-based compensation expense |  |  | $ 75.2 |  |
Number of options, granted (in shares) | shares |  |  | 2,596,568 |  |
Class B Common Stock |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares subject to early exercise, liability recorded in accrued expenses and other current liabilities |  |  | $ 2.1 |  | $ 2.2
Number of options subject to early exercise (in shares) | shares |  |  | 438,877 |  | 467,180
Restricted Stock Units (RSUs) |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Weighted average stock-based compensation recognition period |  |  | 10 months 24 days |  |
Granted during period (in shares) | shares |  |  | 58,825 |  |
Unrecognized compensation costs related to unvested restricted stock units |  |  | $ 1.0 |  |
Shares issued fair value |  |  | $ 1.0 |  |
Stock options |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Weighted average stock-based compensation recognition period |  |  | 3 years 1 month 6 days |  |
ESPP |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Unrecognized compensation costs related to unvested restricted stock units |  |  | $ 10.4 |  |
Shares authorized (in shares) | shares |  | 3,000,000 |  |  |
ESPP offering period |  | 12 months |  |  |
Number of offering periods | offering_period |  | 2 |  |  |
Employee share purchase price percentage |  |  | 85.00% |  |
Stormpath Inc. |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Pre-combination service consideration | $ 3.7 |  |  |  |
Stormpath Inc. | Restricted common stock |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Granted during period (in shares) | shares | 800,000 |  |  |  |
Stock-based compensation vesting period | 2 years |  |  |  |
Shares issued fair value | $ 8.6 |  |  |  |
Stormpath Inc. | Restricted stock awards |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Weighted average stock-based compensation recognition period |  |  | 1 year 9 months 18 days |  |
Unrecognized compensation costs related to unvested restricted stock units |  |  | $ 7.4 |  |
Stormpath Inc. | Stormpath Workforce |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Pre-combination service consideration | 1.5 |  |  |  |
Shares issued fair value | $ 9.1 |  |  |  |
Stormpath Inc. | Stormpath Workforce | Restricted stock awards |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Weighted average stock-based compensation recognition period |  |  | 2 years 8 months 12 days |  |
Granted during period (in shares) | shares | 598,500 |  |  |  |
Unrecognized compensation costs related to unvested restricted stock units | $ 5.5 |  | $ 4.8 |  |
Shares issued fair value | 6.6 |  |  |  |
Stormpath Inc. | Stormpath Workforce | Stock options |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Unrecognized stock-based compensation expense | $ 2.1 |  | $ 2.0 |  |
Weighted average stock-based compensation recognition period |  |  | 3 years 9 months 18 days |  |
Number of options, granted (in shares) | shares | 518,900 |  |  |  |
Stock-based compensation vesting period | 4 years |  |  |  |
Shares issued fair value | $ 2.5 |  |  |  |
Minimum | Stormpath Inc. | Stormpath Workforce | Restricted stock awards |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Weighted average stock-based compensation recognition period | 2 years |  |  |  |
Stock-based compensation vesting period | 2 years |  |  |  |
Maximum | Stormpath Inc. | Stormpath Workforce | Restricted stock awards |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Weighted average stock-based compensation recognition period | 3 years |  |  |  |
Stock-based compensation vesting period | 3 years |  |  |  |

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