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Fair Value Measurements - Additional Information (Details) | 6 Months Ended |
--- | --- | ---
Jul. 31, 2021 USD ($) | Jan. 31, 2021
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Transfers into level 1 to level 2, assets | $ 0 |
Transfers into level 2 to level 1, assets | 0 |
Transfers into level 1 to level 2, liabilities | 0 |
Transfers into level 2 to level 1, liabilities | 0 |
Transfers into level 3, assets | 0 |
Transfers out of level 3, assets | 0 |
Transfers into level 3, liabilities | 0 |
Transfers out of level 3, liabilities | $ 0 |
Level 3 | Discount Rate |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Goodwill and intangible assets measurement input |  | 17.5
Short-term investment |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Fair value, investment | The fair value of the short-term investment, which is a guaranteed investment certificate, is based on its purchase price plus one half of a percent calculated annually. |

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