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Summary of Significant Accounting Policies - Investments (Details) - USD ($) | 6 Months Ended |  |
--- | --- | --- | ---
Jul. 31, 2023 | Oct. 31, 2023 | Jan. 31, 2023
Summary of Investment Holdings [Line Items] |  |  |
Fair Value |  | $ 0 | $ 104,966,000
Accrued interest receivable |  |  | 500,000
U.S. Treasury securities |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Amortized Cost |  |  | 105,415,000
Gross Unrealized Gains | $ 0 |  |
Gross Unrealized Losses | $ (449,000) |  |
Fair Value |  |  | $ 104,966,000

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