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Stockholders' Equity - Narrative (Details) $ / shares in Units, $ in Thousands |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
May 01, 2018 shares | Apr. 26, 2018 | Jan. 31, 2021 USD ($) plan $ / shares shares | Jan. 31, 2020 USD ($) $ / shares shares | Jan. 31, 2019 USD ($) $ / shares shares | Feb. 01, 2021 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Redeemable convertible preferred stock, shares issued (in shares) | 100,200,000 |  |  |  |  |
Number of stock-based compensation plans | plan |  |  | 3 |  |  |
Unrecognized compensation cost, options | $ |  |  | $ 200 |  |  |
Intrinsic value of options exercised | $ |  |  | 302,400 | $ 325,700 | $ 171,600 |
Grant date fair value of options vested | $ |  |  | $ 7,500 | 10,500 | 25,800 |
Percent of purchase price of fair value of common stock |  |  | 85.00% |  |  |
Employee stock purchase plan, compensation expense | $ |  |  | $ 286,877 | $ 206,404 | $ 410,978 |
Reserved for future issuance (in shares) |  |  | 54,990,000 | 50,839,000 |  |
RSUs |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting period |  |  | 4 years |  |  |
Weighted average grant date fair value of RSUs (in usd per share) | $ / shares |  |  | $ 144.80 | $ 56.05 | $ 53.77 |
Grant date fair value | $ |  |  | $ 282,300 | $ 223,000 | $ 260,800 |
Unrecognized compensation cost, RSUs | $ |  |  | $ 680,700 |  |  |
Unrecognized compensation cost, remaining weighted-average period for recognition |  |  | 2 years 2 months 12 days |  |  |
Reserved for future issuance (in shares) |  |  | 10,962,000 | 14,246,000 |  |
Stock options |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Unrecognized compensation cost, remaining weighted-average period for recognition |  |  | 2 months 12 days |  |  |
ESPP offering period |  |  | 6 months |  |  |
Reserved for future issuance (in shares) |  |  | 4,798,000 | 6,882,000 |  |
ESPP |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Annual increase in shares reserved, percentage of total shares |  |  | 1.00% |  |  |
Increase in shares reserved for issuance (in shares) |  |  | 3,800,000 |  |  |
Weighted average grant date fair value of RSUs (in usd per share) | $ / shares |  |  |  |  | $ 14.24 |
Employee contribution, maximum percentage of earnings |  |  | 15.00% |  |  |
ESPP offering period |  | 6 months |  |  |  |
Employee stock purchase plan, compensation expense | $ |  |  | $ 12,600 | $ 8,900 | $ 2,900 |
Reserved for future issuance (in shares) |  |  | 6,329,000 | 4,985,000 |  |
2018 Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Annual increase in shares reserved, percentage of total shares |  |  | 5.00% |  |  |
2018 Plan | Subsequent Event |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Increase in shares reserved for issuance (in shares) |  |  |  |  |  | 9,600,000
2018 Plan | RSUs |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Annual vesting percentage |  |  | 25.00% |  |  |
Vesting period |  |  | 1 year |  |  |
Common Stock |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Shares issued upon conversion (in shares) | 100,400,000 |  | 4,698,000 |  | 100,350,000 |

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