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Income Taxes - Additional Information (Details) - USD ($) $ in Thousands | 12 Months Ended
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Jan. 31, 2021 | Jan. 31, 2020 | Jan. 31, 2019
Operating Loss Carryforwards [Line Items] |  |  |
Employee stock purchase plan, compensation expense | $ 286,877 | $ 206,404 | $ 410,978
Tax benefit from compensation expense | 2,200 | 1,000 | 1,700
Unrecognized tax benefits that would affect tax rate, if recognized | 15,900 |  |
Liability for uncertain tax positions | 16,700 | 3,300 | $ 2,900
Accrued interest and penalties | 800 |  |
Increase (decrease) in valuation allowance | 278,000 | $ 163,600 |
Domestic Tax Authority |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Operating loss carryforwards | 2,800,000 |  |
Operating loss carryforwards not limited to 80% of taxable income | 2,300,000 |  |
Research tax credit carryforwards | 63,900 |  |
State and Local Jurisdiction |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Operating loss carryforwards | 1,300,000 |  |
Research tax credit carryforwards | 17,000 |  |
Foreign Tax Authority |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Operating loss carryforwards | $ 38,000 |  |

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