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Equity - Narrative (Details) $ / shares in Units, $ in Thousands |  |  |  |  | 1 Months Ended | 12 Months Ended |  |
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Nov. 25, 2024 USD ($) shares | Feb. 01, 2024 shares | Dec. 20, 2023 USD ($) shares | Mar. 31, 2022 USD ($) founder shares | Sep. 30, 2024 USD ($) $ / shares shares | Aug. 31, 2024 USD ($) | Jan. 31, 2025 USD ($) class $ / shares shares | Jan. 31, 2024 USD ($) $ / shares shares | Jan. 31, 2023 USD ($) founder $ / shares shares | Feb. 28, 2023 USD ($) | Jan. 31, 2022 shares
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares authorized (in shares) |  |  |  |  |  |  |  | 200,000,000 | 200,000,000 |  |  |
Preferred stock, par value (in dollars per share) | $ / shares |  |  |  |  |  |  |  | $ 0.0001 | $ 0.0001 |  |  |
Preferred stock, shares outstanding (in shares) |  |  |  |  |  |  |  | 0 | 0 |  |  |
Common stock, number of classes of stock | class |  |  |  |  |  |  |  | 2 |  |  |  |
Stock repurchase program, authorized amount | $ |  |  |  |  |  |  |  |  |  |  | $ 2,000,000 |
Stock repurchase program, additional authorized amount | $ |  |  |  |  |  |  | $ 2,500,000 |  |  |  |  |
Number of shares repurchased (in shares) |  |  |  |  |  |  |  | 14,765,000 | 4,012,000 |  |  |
Aggregate purchase price | $ |  |  |  |  |  |  |  | $ 1,932,164 | $ 591,673 |  |  |
Weighted-average price per share (in dollars per share) | $ / shares |  |  |  |  |  |  |  | $ 130.87 | $ 147.49 |  |  |
Shares authorized for repurchase | $ |  |  |  |  |  |  |  | $ 2,000,000 |  |  |  |
Repurchases of common stock as treasury stock (in shares) |  |  |  |  |  |  |  |  | (500,000) |  |  |
Treasury stock reissued (in shares) |  |  |  |  |  |  |  | 56,000 | 8,000 |  |  |
Common stock reserved for future issuances (shares) |  |  |  |  |  |  |  | 127,723,000 | 121,461,000 |  |  |
Weighted-average grant date fair value of options granted (in dollars per share) | $ / shares |  |  |  |  |  |  |  | $ 79.16 |  | $ 101.66 |  |
Options granted (in shares) |  |  |  |  |  |  |  | 1,037,000 | 0 | 642,000 |  |
Intrinsic value of shares exercised | $ |  |  |  |  |  |  |  | $ 913,900 | $ 1,300,000 | $ 1,000,000 |  |
Grant date fair value of vested shares | $ |  |  |  |  |  |  |  | 31,200 | 42,300 | 79,100 |  |
Stock-based compensation, net of amounts capitalized | $ |  |  |  |  |  |  |  | $ 1,479,314 | $ 1,168,015 | $ 861,533 |  |
Expected dividend yield |  |  |  |  |  |  |  | 0.00% | 0.00% | 0.00% |  |
Unrecognized share-based compensation expense | $ |  |  |  |  |  |  |  | $ 3,500,000 |  |  |  |
Unrecognized share-based compensation expense recognition period (in years) |  |  |  |  |  |  |  | 2 years 9 months 18 days |  |  |  |
ESPP Rights |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |
Common stock reserved for future issuances (shares) |  |  |  |  |  |  |  | 16,446,000 | 13,764,000 |  |  |
Shares authorized (in shares) |  |  | 3,300,000 |  |  |  |  |  |  |  |  |
Stock market discount |  |  |  |  |  |  |  | 85.00% |  |  |  |
Offering period (months) |  |  |  |  |  |  |  | 6 months |  |  |  |
Expected dividend yield |  |  |  |  |  |  |  | 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 |  |  |  |
Award holding period (in years) |  |  |  |  |  |  |  | 1 year |  |  |  |
Discount for lack of marketability, percent |  |  |  |  |  |  |  | 7.60% |  |  |  |
Expected dividend yield |  |  |  |  |  |  |  | 0.00% |  | 0.00% |  |
Equity-Classified Restricted Stock Units (RSUs) |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |
Granted (in shares) |  |  |  |  |  |  |  | 17,096,000 | 12,706,000 | 10,788,000 |  |
Nonvested (in shares) |  |  |  |  |  |  |  | 23,354,000 | 19,575,000 | 15,560,000 |  | 9,612,000
2020 Plan |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |
Shares authorized (in shares) |  |  | 16,700,000 |  |  |  |  |  |  |  |  |
2020 Plan | Stock options |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |
Common stock reserved for future issuances (shares) |  |  |  |  |  |  |  | 1,586,000 | 602,000 |  |  |
2020 Plan | RSUs |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |
Common stock reserved for future issuances (shares) |  |  |  |  |  |  |  | 24,790,000 | 20,168,000 |  |  |
2020 Plan | Equity-Classified Performance Shares |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |
Vesting period (years) |  |  |  |  |  |  |  | 4 years |  |  |  |
Granted (in shares) |  |  |  |  |  |  |  | 800,000 | 500,000 |  |  |
Stock-based compensation, net of amounts capitalized | $ |  |  |  |  |  |  |  | $ 60,200 | $ 30,800 |  |  |
2020 Plan | Equity-Classified Performance Shares | Minimum |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |
Performance target, percentage |  |  |  |  |  |  |  | 0.00% |  |  |  |
2020 Plan | Equity-Classified Performance Shares | Maximum |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |
Performance target, percentage |  |  |  |  |  |  |  | 120.00% |  |  |  |
2020 Plan | Equity-Classified Performance Shares | Grant Date |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |
Vesting period (years) |  |  |  |  |  |  |  | 1 year |  |  |  |
2020 Plan | Equity-Classified Restricted Stock Units (RSUs) |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |
Vesting period (years) |  |  |  |  |  |  |  | 4 years |  |  |  |
2012 Plan | Stock options |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |
Common stock reserved for future issuances (shares) |  |  |  |  |  |  |  | 20,067,000 | 26,767,000 |  |  |
Expiration period (years) |  |  |  |  |  |  |  | 10 years |  |  |  |
2012 Plan | RSUs |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |
Common stock reserved for future issuances (shares) |  |  |  |  |  |  |  | 0 | 789,000 |  |  |
2012 Plan | Equity-Classified Restricted Stock Units (RSUs) |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |
Vesting period (years) |  |  |  |  |  |  |  | 4 years |  |  |  |
2012 Plan | Equity-Classified Restricted Stock Units (RSUs) | Grant Date |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |
Vesting period (years) |  |  |  |  |  |  |  | 1 year |  |  |  |
Outside of the Plans | Restricted Common Stock |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |
Granted (in shares) |  |  |  |  |  |  |  | 445,000 | 385,000 | 409,000 |  |
Nonvested (in shares) |  |  |  |  |  |  |  | 821,000 | 671,000 | 428,000 |  | 380,000
Samooha, Inc. | Investing Subsidiary |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition, equity interest issued or issuable (in shares) |  |  |  | 200,000 |  |  |  |  | 200,000 |  |  |
Treasury stock retired (in shares) |  |  |  |  |  |  |  | 200,000 |  |  |  |
Samooha, Inc. | 2020 Plan | Liability-Classified Performance Shares |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |
Vesting period (years) |  |  |  |  |  |  |  |  | 4 years |  |  |
Stock-based compensation, net of amounts capitalized | $ |  |  |  |  |  |  |  | $ 10,600 | $ 500 |  |  |
Shares available for grant (in shares) |  |  |  |  |  |  |  | 1,700,000 |  |  |  |
Share based payment arrangement, liabilities | $ |  |  |  |  |  |  |  | $ 11,100 | $ 500 |  |  |
Samooha, Inc. | 2020 Plan | Liability-Classified Performance Shares | Grant Date |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |
Vesting period (years) |  |  |  |  |  |  |  |  | 1 year |  |  |
Streamlit, Inc. |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |
Number of founders | founder |  |  |  |  | 3 |  |  |  |  | 3 |  |
Class A Common Stock |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |
Common stock, par value (in dollars per share) | $ / shares |  |  |  |  |  |  |  | $ 0.0001 | $ 0.0001 |  |  |
Common stock, shares outstanding (in shares) | [1] |  |  |  |  |  |  | 333,865,000 | 333,961,000 |  |  |
Class A Common Stock | Shares Repurchased In Privately Negotiated Transactions Entered Into In Connection With Convertible Senior Notes |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |
Number of shares repurchased (in shares) |  |  |  |  |  | 3,600,000 |  |  |  |  |  |
Aggregate purchase price | $ |  |  |  |  |  | $ 399,600 |  |  |  |  |  |
Weighted-average price per share (in dollars per share) | $ / shares |  |  |  |  |  | $ 112.50 |  |  |  |  |  |
Class A Common Stock | ESPP Rights |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |
Common stock reserved for future issuances (shares) |  |  |  |  |  |  |  | 5,700,000 |  |  |  |
Class A Common Stock | 2020 Plan |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |
Common stock reserved for future issuances (shares) |  |  |  |  |  |  |  | 34,100,000 |  |  |  |
Maximum common shares authorized to be outstanding (shares) |  |  |  |  |  |  |  | 78,800,000 |  |  |  |
Class A Common Stock | Samooha, Inc. | Outside of the Plans | Restricted Common Stock |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |
Granted (in shares) |  |  |  | 400,000 |  |  |  |  | 400,000 |  |  |
Vesting period (in years) |  |  |  | 4 years |  |  |  |  | 4 years |  |  |
Fair value | $ |  |  |  | $ 74,800 |  |  |  |  | $ 74,800 |  |  |
Requisite service period (in years) |  |  |  | 4 years |  |  |  |  | 4 years |  |  |
Nonvested (in shares) |  |  |  |  |  |  |  | 300,000 | 400,000 |  |  |
Class A Common Stock | Streamlit, Inc. |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition, equity interest issued or issuable (in shares) |  |  |  |  | 1,900,000 |  |  |  |  |  |  |
Class A Common Stock | Streamlit, Inc. | Outside of the Plans | Restricted Common Stock |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |
Granted (in shares) |  |  |  |  | 400,000 |  |  |  |  | 400,000 |  |
Vesting period (in years) |  |  |  |  | 3 years |  |  |  |  | 3 years |  |
Fair value | $ |  |  |  |  | $ 93,700 |  |  |  |  | $ 93,700 |  |
Requisite service period (in years) |  |  |  |  | 3 years |  |  |  |  | 3 years |  |
Nonvested (in shares) |  |  |  |  |  |  |  | 100,000 | 300,000 |  |  |
Class A Common Stock | Datavolo, Inc. |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition, equity interest issued or issuable (in shares) |  | 500,000 |  |  |  |  |  |  |  |  |  |
Class A Common Stock | Datavolo, Inc. | Outside of the Plans | Restricted Common Stock |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |
Granted (in shares) |  | 400,000 |  |  |  |  |  | 400,000 |  |  |  |
Vesting period (in years) |  | 4 years |  |  |  |  |  | 4 years |  |  |  |
Fair value | $ |  | $ 64,600 |  |  |  |  |  | $ 64,600 |  |  |  |
Requisite service period (in years) |  | 4 years |  |  |  |  |  | 4 years |  |  |  |
Nonvested (in shares) |  |  |  |  |  |  |  | 400,000 |  |  |  |
Class B Common Stock |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |
Common stock, par value (in dollars per share) | $ / shares |  |  |  |  |  |  |  | $ 0.0001 | $ 0.0001 |  |  |
Common stock, shares outstanding (in shares) |  |  |  |  |  |  |  | 0 | 0 |  |  |
[1] | In connection with a business combination completed on December 20, 2023, the Company issued approximately 0.2 million shares of its Class A common stock to one of its wholly-owned subsidiaries, in exchange for a noncontrolling equity interest in the acquired company that was held by the subsidiary prior to this business combination. These shares were treated as treasury stock for accounting purposes as of January 31, 2024, and were subsequently transferred to the Company and retired during the fiscal year ended January 31, 2025. These shares are not reflected in the Company’s consolidated balance sheets. See Note 7, “Business Combinations,” and Note 12, “Equity,” for further details.

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