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Investments - Narrative (Details)
8 Months Ended 12 Months Ended
Jan. 31, 2022
USD ($)
security
Jan. 31, 2022
USD ($)
security
Jan. 31, 2021
USD ($)
security
Jan. 31, 2020
USD ($)
Debt and Equity Securities, FV-NI [Line Items]        
Unrealized loss of debt securities held for greater than twelve months | security 0 0 0  
Credit losses on debt securities   $ 0 $ 0 $ 0
Proceeds from sale of debt securities, available-for-sale   162,000,000 11,000,000 6,000,000
Payments to acquire equity method investments     $ 50,000,000  
Equity method investment, ownership percentage     6.00%  
Equity method investment, impairment loss   0 $ 0 0
Proceeds from sale of available-for-sale securities, equity $ 25,000,000 37,000,000 0 51,000,000
Realized gain from sale of available-for-sale securities, equity 16,000,000 22,273,000 1,667,000 26,837,000
Non-cash gain on the sale of a non-marketable equity investment   67,000,000 14,000,000 0
Equity securities without readily determinable fair value, upward price adjustment, annual amount   58,000,000 9,000,000 6,000,000
Non-cash gain on the sale of a non-marketable equity investment   7,000,000   7,000,000
Included in Marketable securities        
Debt and Equity Securities, FV-NI [Line Items]        
Non-cash gain on the sale of a non-marketable equity investment   67,000,000    
Zimit, Inc.        
Debt and Equity Securities, FV-NI [Line Items]        
Non-cash gain on the sale of a non-marketable equity investment   12,000,000    
Scout RFP        
Debt and Equity Securities, FV-NI [Line Items]        
Non-cash gain on the sale of a non-marketable equity investment       $ 20,000,000
Included in Marketable securities        
Debt and Equity Securities, FV-NI [Line Items]        
Carrying value $ 104,318,000 $ 104,318,000 $ 21,300,000