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Investments - Equity Investments (Details) - USD ($) $ in Thousands	Jul. 31, 2021	Jan. 31, 2021
Schedule of Equity Method Investments [Line Items]
Equity investments accounted for under the equity method	$ 0	$ 48,222
Non-marketable equity investments measured using the measurement alternative	125,075	73,142
Equity investments	680,744	802,628
Cash and cash equivalents
Schedule of Equity Method Investments [Line Items]
Equity securities	414,663	659,964
Marketable securities
Schedule of Equity Method Investments [Line Items]
Equity securities	$ 141,006	$ 21,300

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- Definition

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+ References

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Amount of investment in equity security without readily determinable fair value.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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