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Cash Equivalents and Short Term Investments - Additional Information (Details) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jul. 31, 2022 USD ($) investment | Jul. 31, 2022 USD ($) investment | Jul. 31, 2021 USD ($) | Jan. 31, 2022 USD ($) investment
Cash and Cash Equivalents [Abstract] |  |  |  |
Reclassify from accumulated other comprehensive income (loss) |  | $ 0 | $ 0 |
Contractual maturity in one year | $ 118,500,000 | 118,500,000 |  | $ 108,300,000
Contractual maturity greater than one year | $ 27,300,000 | $ 27,300,000 |  | $ 2,000,000
Number of short-term investments in unrealized loss position | Investment | investment | 35 | 35 |  | 25
Short-term investments estimated fair value | $ 122,100,000 | $ 122,100,000 |  | $ 71,800,000
Impairment of short-term investments | $ 0 | $ 0 |  |

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- Definition Number of investments in debt securities measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (b)(3) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 4 -Subparagraph (b)(3) -URI https://asc.fasb.org/extlink&oid=124269663&loc=SL82922888-210455 + Details
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