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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