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Equity - Narrative (Details) $ / shares in Units, $ in Millions |  |  |  |  |  | 3 Months Ended | 6 Months Ended |  |
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Mar. 31, 2022 USD ($) co-founder shares | Feb. 01, 2022 shares | Mar. 03, 2021 shares | Mar. 01, 2021 vote $ / shares shares | Feb. 28, 2021 vote | Jul. 31, 2022 USD ($) $ / shares shares | Apr. 30, 2022 shares | Jul. 31, 2021 shares | Jul. 31, 2022 USD ($) co-founder $ / shares shares | Jul. 31, 2021 USD ($) shares | Jan. 31, 2022 $ / shares shares | Sep. 30, 2020 class $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares authorized (in shares) |  |  |  |  |  | 200,000,000 |  |  | 200,000,000 |  | 200,000,000 | 200,000,000
Preferred stock, par value (in dollars per share) | $ / shares |  |  |  |  |  | $ 0.0001 |  |  | $ 0.0001 |  | $ 0.0001 | $ 0.0001
Common stock, number of classes of stock | class |  |  |  |  |  |  |  |  |  |  |  | 2
Conversion, percent threshold |  |  |  |  | 10.00% |  |  |  |  |  |  |
Shares authorized (in shares) |  |  |  |  |  |  | 15,619,000 |  |  |  |  |
Granted (per share) | $ / shares |  |  |  |  |  |  |  |  | $ 101.66 |  |  |
Options granted (shares) |  |  |  |  |  | 0 | 642,000 | 0 |  | 0 |  |
Intrinsic value of shares exercised | $ |  |  |  |  |  |  |  |  | $ 704.6 | $ 2,600.0 |  |
Grant date fair value of vested shares | $ |  |  |  |  |  |  |  |  | $ 41.3 | $ 44.1 |  |
Expected dividend yield |  |  |  |  |  |  |  |  | 0.00% |  |  |
Unrecognized share-based compensation expense | $ |  |  |  |  |  | $ 2,400.0 |  |  | $ 2,400.0 |  |  |
Unrecognized share-based compensation expense recognition period (term) |  |  |  |  |  |  |  |  | 3 years 2 months 12 days |  |  |
Streamlit, Inc. |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |
Number of founders | co-founder | 3 |  |  |  |  |  |  |  | 3 |  |  |
2020 Equity Incentive Plan: |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |
Shares authorized (in shares) |  | 15,600,000 |  |  |  |  |  |  |  |  |  |
Employee stock purchase rights under the 2020 ESPP |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |
Offering period |  |  |  |  |  |  |  |  | 6 months |  |  |
Shares authorized (in shares) |  | 3,100,000 |  |  |  |  |  |  |  |  |  |
Expected dividend yield |  |  |  |  |  | 0.00% |  | 0.00% | 0.00% | 0.00% |  |
Stock options |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |
Vesting period (years) |  |  |  |  |  |  |  |  | 4 years |  |  |
Expiration period (years) |  |  |  |  |  |  |  |  | 10 years |  |  |
Expected dividend yield |  |  |  |  |  |  |  |  | 0.00% |  |  |
Stock options | 2012 Equity Incentive Plan: |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |
Expiration period (years) |  |  |  |  |  |  |  |  | 10 years |  |  |
RSUs |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |
Vesting period (years) |  |  |  |  |  |  |  |  | 4 years |  |  |
Granted (shares) |  |  |  |  |  | 1,374,000 | 5,763,000 |  |  |  |  |
Share-based compensation arrangement by share-based payment award, equity instruments other than options, nonvested, number |  |  |  |  |  | 14,337,000 | 14,200,000 |  | 14,337,000 |  | 9,612,000 |
RSUs | Grant Date |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |
Vesting period (years) |  |  |  |  |  |  |  |  | 1 year |  |  |
RCS | Outside of the Plans |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |
Granted (shares) |  |  |  |  |  |  | 409,000 |  |  |  |  |
Share-based compensation arrangement by share-based payment award, equity instruments other than options, nonvested, number |  |  |  |  |  | 609,000 | 699,000 |  | 609,000 |  | 380,000 |
RCS | Outside of the Plans | Streamlit, Inc. |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |
Share-based compensation arrangement by share-based payment award, equity instruments other than options, nonvested, number |  |  |  |  |  | 400,000 |  |  | 400,000 |  |  |
Class A Common Stock |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares authorized (in shares) |  |  |  |  |  | 2,500,000,000 |  |  | 2,500,000,000 |  | 2,500,000,000 | 2,500,000,000
Common stock, par value (in dollars per share) | $ / shares |  |  |  | $ 0.0001 |  | $ 0.0001 |  |  | $ 0.0001 |  | $ 0.0001 |
Common stock, voting rights, votes per share | vote |  |  |  | 1 |  |  |  |  |  |  |  |
Class A Common Stock | RCS | Outside of the Plans | Streamlit, Inc. |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |
Granted (shares) | 400,000 |  |  |  |  |  |  |  | 400,000 |  |  |
Post-combination share-based compensation arrangement by share-based payment award, award vesting period | 3 years |  |  |  |  |  |  |  | 3 years |  |  |
Post-combination share-based compensation arrangement by share-based payment award, equity instruments other than options, granted in period, total fair value | $ | $ 93.7 |  |  |  |  |  |  |  | $ 93.7 |  |  |
Post-combination share-based compensation arrangement by share-based payment award, award service period | 3 years |  |  |  |  |  |  |  | 3 years |  |  |
Class B Common Stock |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares authorized (in shares) |  |  |  |  |  | 185,461,000 |  |  | 185,461,000 |  | 185,461,000 | 355,000,000
Shares converted (in shares) |  |  | 169,500,000 | 169,500,000 |  |  |  |  |  |  |  |
Common stock, par value (in dollars per share) | $ / shares |  |  |  | $ 0.0001 |  | $ 0.0001 |  |  | $ 0.0001 |  | $ 0.0001 |
Common stock, voting rights, votes per share | vote |  |  |  |  | 10 |  |  |  |  |  |  |

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