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Investments - Narrative (Details) - USD ($) |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Sep. 28, 2021 | Jun. 30, 2021 | Oct. 31, 2021 | Oct. 31, 2020 | Oct. 31, 2021 | Oct. 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%
Impairment loss |  |  | 0 | 0 | 0 | 0 |
Proceeds from sale of available-for-sale securities, equity |  | $ 5,000,000 | 0 | 0 | 17,000,000 | 0 |
Net realized gains (losses) recognized on equity investments sold |  | $ 3,000,000 | 11,759,000 | 0 | 4,236,000 | 1,591,000 |
Upward price adjustment to non-marketable equity investments |  |  | 20,000,000 | 0 | 34,000,000 | 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 |  |  |  |  | 7,000,000 |  |
Included in Marketable securities |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Equity securities, unrealized loss |  |  | 7,000,000 |  |  |  |
Equity securities, unrealized gain |  |  |  |  | 91,000,000 |  |
Zimit, Inc. |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Gain on sale of equity securities marketable equity investments | $ 12,000,000 |  |  |  |  |  |
Included in Marketable securities |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Equity securities |  |  | $ 134,462,000 |  | $ 134,462,000 |  | $ 21,300,000

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