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Investments - Schedule of Marketable Equity Investments (Details) - USD ($) $ in Thousands	Jul. 31, 2021	Jan. 31, 2021
Debt and Equity Securities, FV-NI [Line Items]
Total initial cost	$ 47,513	$ 5,000
Cumulative net unrealized gains (losses)	93,493	16,300
Marketable securities
Debt and Equity Securities, FV-NI [Line Items]
Equity securities	$ 141,006	$ 21,300

X

- 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

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- Definition

Cost of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). Excludes equity method investment and investment in equity security without readily determinable fair value.

+ References

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- Definition

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+ References

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- Definition

Equity Securities, Cumulative Net Unrealized Gains (Losses)

+ References

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