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Investments - Schedule of Marketable Equity Investments (Details) - USD ($) $ in Thousands | Oct. 31, 2021 | Jan. 31, 2021
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Debt and Equity Securities, FV-NI [Line Items] |  |
Total initial cost | $ 47,513 | $ 5,000
Cumulative net unrealized gains (losses) | 86,949 | 16,300
Marketable securities |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Equity securities | $ 134,462 | $ 21,300

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- Definition Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI), classified as current. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=123594786&loc=SL75136599-209740 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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