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Income Taxes - Additional Information (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Apr. 30, 2020 | Jan. 31, 2021 | Jan. 31, 2020
Income Tax Disclosure [Line Items] |  |  |
Federal corporate tax rate |  | 21.00% |
Valuation allowance increase (decrease), amount |  | $ (15.1) | $ 26.5
Foreign |  |  |
Income Tax Disclosure [Line Items] |  |  |
Net operating loss carry forwards |  | $ 318.4 |
Foreign | United Kingdom Tax Department |  |  |
Income Tax Disclosure [Line Items] |  |  |
Percentage of corporate income tax rate | 17.00% | 19.00% |
Remeasured UK deferred tax assets benefit |  | $ 6.5 |
Federal |  |  |
Income Tax Disclosure [Line Items] |  |  |
Net operating loss carry forwards |  | 697.1 |
Tax credit carry forward |  | $ 39.1 |
Operating loss carryforwards expiration year |  | 2025 |
Research and development tax credit carryforwards expiration year |  | 2025 |
Net operating loss carry forwards with indefinite expiration |  | $ 75.3 |
State |  |  |
Income Tax Disclosure [Line Items] |  |  |
Net operating loss carry forwards |  | 561.7 |
Tax credit carry forward |  | $ 41.2 |
Operating loss carryforwards expiration year |  | 2022 |

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