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Fair Value Measurements - Schedule of Carrying Values and Estimated Fair Values of Financial Liabilities (Details) - USD ($) $ in Thousands | Jun. 30, 2026 | Sep. 30, 2025
--- | --- | ---
Carrying Amount |  |
Financial liabilities |  |
Total financial liabilities | $ 1,069,132 | $ 1,029,114
Carrying Amount | Senior Notes |  |
Financial liabilities |  |
Total financial liabilities | 989,112 | 950,644
Carrying Amount | Junior Subordinated Notes |  |
Financial liabilities |  |
Total financial liabilities | 80,020 | 78,470
Fair Value |  |
Financial liabilities |  |
Total financial liabilities | 1,084,406 | 1,047,104
Fair Value | Senior Notes |  |
Financial liabilities |  |
Total financial liabilities | 1,004,386 | 968,634
Fair Value | Junior Subordinated Notes |  |
Financial liabilities |  |
Total financial liabilities | $ 80,020 | $ 78,470

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