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Income Taxes - Additional Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jan. 31, 2025 | Jan. 31, 2025 | Jan. 31, 2024 | Jan. 31, 2023 | Jan. 31, 2022
Income Tax Disclosure [Line Items] |  |  |  |  |
Federal corporate tax rate |  | 21.00% |  |  |
Valuation allowance increase (decrease), amount |  | $ (202,200) | $ (101,200) |  |
Valuation allowance | $ 28,526 | 28,526 | 230,686 |  |
Net deferred tax asset | 295,094 | 295,094 | 330,965 |  |
Decrease in unrecognized tax benefit is reasonably possible in next 12 months | 70,000 | 70,000 |  |  |
Unrecognized tax benefits | 132,574 | 132,574 | 118,981 | $ 103,636 | $ 90,678
Unrecognized tax benefits that would impact effective tax rate | 69,100 | 69,100 |  |  |
Unrecognized tax benefits that would impact deferred tax assets adjustment | 63,500 | $ 63,500 |  |  |
UK |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |
Open tax year |  | 2021 |  |  |
US |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |
Valuation allowance increase (decrease), amount | 201,200 |  |  |  |
Capitalization Requirement in Current Year |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |
Net deferred tax asset | 90,200 | $ 90,200 | $ 68,000 |  |
Foreign |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |
Net operating loss carry forwards | 268,500 | $ 268,500 |  |  |
Research and experimental capitalized and amortized over period |  | 15 years |  |  |
Federal |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |
Valuation allowance increase (decrease), amount | 201,200 |  |  |  |
Net operating loss carry forwards | 233,700 | $ 233,700 |  |  |
Tax credit carry forward | 69,400 | $ 69,400 |  |  |
Operating loss carryforwards expiration year |  | 2037 |  |  |
Research and development tax credit carryforwards expiration year |  | 2026 |  |  |
Net operating loss carry forwards with indefinite expiration | 125,300 | $ 125,300 |  |  |
Research and experimental capitalized and amortized over period |  | 5 years |  |  |
State |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |
Valuation allowance increase (decrease), amount | 201,200 |  |  |  |
Net operating loss carry forwards | 487,300 | $ 487,300 |  |  |
Tax credit carry forward | $ 65,600 | $ 65,600 |  |  |
Operating loss carryforwards expiration year |  | 2027 |  |  |

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