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Fair Value Measurements - Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis (Details) - USD ($) $ in Thousands | Mar. 31, 2025 | Sep. 30, 2024
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Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Financial instruments net assets | $ 123,209 | $ 96,288
Total debt and equity securities | 109,049 | 110,594
Total assets | 232,258 | 206,882
Financial instruments net liability | 561 | 7,637
Registered investment companies |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Equity securities | 27,787 | 28,311
Bond mutual funds |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Equity securities | 40,955 | 40,341
Bonds |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Debt securities | 37,118 | 39,142
Money market funds |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Equity securities | 3,189 | 2,800
Quoted Prices in Active Markets (Level 1) |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Financial instruments gross assets | 0 | 0
Total debt and equity securities | 68,742 | 68,652
Total assets | 68,742 | 68,652
Financial instruments gross liability | 0 | 0
Quoted Prices in Active Markets (Level 1) | Registered investment companies |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Equity securities | 27,787 | 28,311
Quoted Prices in Active Markets (Level 1) | Bond mutual funds |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Equity securities | 40,955 | 40,341
Quoted Prices in Active Markets (Level 1) | Bonds |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Debt securities | 0 | 0
Quoted Prices in Active Markets (Level 1) | Money market funds |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Equity securities | 0 | 0
Significant Other Observable Inputs (Level 2) |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Financial instruments gross assets | 123,209 | 96,288
Total debt and equity securities | 40,307 | 41,942
Total assets | 163,516 | 138,230
Financial instruments gross liability | 561 | 7,637
Significant Other Observable Inputs (Level 2) | Registered investment companies |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Equity securities | 0 | 0
Significant Other Observable Inputs (Level 2) | Bond mutual funds |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Equity securities | 0 | 0
Significant Other Observable Inputs (Level 2) | Bonds |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Debt securities | 37,118 | 39,142
Significant Other Observable Inputs (Level 2) | Money market funds |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Equity securities | 3,189 | 2,800
Significant Other Unobservable Inputs (Level 3) |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Financial instruments gross assets | 0 | 0
Total debt and equity securities | 0 | 0
Total assets | 0 | 0
Financial instruments gross liability | 0 | 0
Significant Other Unobservable Inputs (Level 3) | Registered investment companies |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Equity securities | 0 | 0
Significant Other Unobservable Inputs (Level 3) | Bond mutual funds |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Equity securities | 0 | 0
Significant Other Unobservable Inputs (Level 3) | Bonds |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Debt securities | 0 | 0
Significant Other Unobservable Inputs (Level 3) | Money market funds |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Equity securities | $ 0 | $ 0

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