Fair Value Measurements - Carrying Values and Estimated Fair Values of Other Financial Assets and Liabilities (Details) - USD ($) $ in Thousands |
Mar. 31, 2024 |
Sep. 30, 2023 |
---|---|---|
Carrying Amount | ||
Financial assets | ||
Total financial assets | $ 9,279 | $ 1,951 |
Financial liabilities | ||
Total financial liabilities | 1,023,311 | 978,028 |
Carrying Amount | Senior Notes | ||
Financial liabilities | ||
Total financial liabilities | 947,941 | 903,691 |
Carrying Amount | Junior Subordinated Notes | ||
Financial liabilities | ||
Total financial liabilities | 75,370 | 74,337 |
Fair Value | ||
Financial assets | ||
Total financial assets | 9,579 | 1,986 |
Financial liabilities | ||
Total financial liabilities | 1,034,350 | 932,865 |
Fair Value | Senior Notes | ||
Financial liabilities | ||
Total financial liabilities | 958,980 | 858,528 |
Fair Value | Junior Subordinated Notes | ||
Financial liabilities | ||
Total financial liabilities | $ 75,370 | $ 74,337 |