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Investments - Narrative (Details) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2021
Jul. 31, 2021
Jul. 31, 2020
Jul. 31, 2021
Jul. 31, 2020
Jan. 31, 2021
Schedule of Equity Method Investments [Line Items]            
Proceeds of sale of debt securities   $ 0 $ 0 $ 10,000,000 $ 5,000,000  
Payments to acquire equity method investments           $ 50,000,000
Equity method investment, ownership percentage           6.00%
Gains (losses) from equity method investments   200,000 (1,000,000) (2,000,000) (2,000,000)  
Impairment loss   0 0 0 0  
Proceeds from sale of available-for-sale securities, equity $ 5,000,000 15,000,000 0 17,000,000 0  
Net realized gains (losses) recognized on equity investments sold $ 3,000,000 2,767,000 0 (6,379,000) 1,591,000  
Upward price adjustment to non-marketable equity investments   6,000,000 0 14,000,000 0  
Downward price adjustment to non-marketable equity investments     0   0  
Impairment loss on non-marketable equity securities   0 $ 0 2,000,000 $ 3,000,000  
Equity securities, FV-NI, cost, sold   6,000,000   7,000,000    
Included in Marketable securities            
Schedule of Equity Method Investments [Line Items]            
Equity securities   $ 141,006,000   $ 141,006,000   $ 21,300,000