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Fair Value Measurements - Schedule of Carrying Values and Estimated Fair Values of Other Financial Assets and Liabilities (Details) - USD ($) $ in Thousands | Mar. 31, 2025 | Sep. 30, 2024
--- | --- | ---
Carrying Amount |  |
Financial assets |  |
Total financial assets | $ 5,461 | $ 9,449
Financial liabilities |  |
Total financial liabilities | 1,027,231 | 1,025,349
Carrying Amount | Senior Notes |  |
Financial liabilities |  |
Total financial liabilities |  | 948,945
Carrying Amount | Junior Subordinated Notes |  |
Financial liabilities |  |
Total financial liabilities |  | 76,404
Fair Value |  |
Financial assets |  |
Total financial assets | 5,461 | 9,584
Financial liabilities |  |
Total financial liabilities | 1,015,745 | 1,052,898
Fair Value | Senior Notes |  |
Financial liabilities |  |
Total financial liabilities | 938,308 | 976,494
Fair Value | Junior Subordinated Notes |  |
Financial liabilities |  |
Total financial liabilities | $ 77,437 | $ 76,404

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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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