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Fair Value Measurements (Tables) | 6 Months Ended
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Mar. 31, 2025
Fair Value Disclosures [Abstract] |
Schedule of Fair Value Assets Measured on a Recurring and Non-Recurring Basis | The following table presents the period-end balances of assets measured at fair value for each hierarchy level:
in thousands | Level 1 |  | Level 2 |  | Level 3 |  | Total
As of March 31, 2025 |  |  |  |  |  |  |
Deferred compensation plan assets(a) | $ | 7,677 |  |  | $ | — |  |  | $ | — |  |  | $ | 7,677 |
As of September 30, 2024 |  |  |  |  |  |  |
Deferred compensation plan assets(a) | $ | 8,115 |  |  | $ | — |  |  | $ | — |  |  | $ | 8,115 |
(a) Amount is measured at fair value on a recurring basis and included in other assets within the condensed consolidated balance sheets.
Schedule of Carrying Values and Estimated Fair Values of Other Financial Assets and Liabilities | The following table presents the carrying value and estimated fair value of certain other financial assets and liabilities as of March 31, 2025 and September 30, 2024:
| As of March 31, 2025 |  | As of September 30, 2024
in thousands | Carrying Amount |  | Fair Value |  | Carrying Amount |  | Fair Value
Financial assets |  |  |  |  |  |  |
Certificates of deposit(a) | $ | 5,461 |  |  | $ | 5,461 |  |  | $ | 9,449 |  |  | $ | 9,584 |
Total financial assets | $ | 5,461 |  |  | $ | 5,461 |  |  | $ | 9,449 |  |  | $ | 9,584 |
Financial liabilities(b) |  |  |  |  |  |  |
Senior Notes(c) | $ | 949,794 |  |  | $ | 938,308 |  |  | $ | 948,945 |  |  | $ | 976,494 |
Junior Subordinated Notes(d) | 77,437 |  |  | 77,437 |  |  | 76,404 |  |  | 76,404 |
Total financial liabilities | $ | 1,027,231 |  |  | $ | 1,015,745 |  |  | $ | 1,025,349 |  |  | $ | 1,052,898 |
(a) Certificates of deposit held for investment with an original maturity greater than three months are carried at original cost plus accrued interest and reported as other assets on the condensed consolidated balance sheets. The type of certificates of deposit that the Company invests in are not considered debt securities under ASC Topic 320, Investments - Debt Securities. The estimated fair value of our certificates of deposit has been determined using quoted market rates (Level 2). (b) Carrying amounts for financial liabilities are net of unamortized debt issuance costs or accretion. (c) The estimated fair value of our publicly-held Senior Notes has been determined using quoted market rates (Level 2). (d) Since there is no trading market for our Junior Subordinated Notes, the fair value of these notes is estimated by discounting scheduled cash flows through maturity (Level 3). The discount rate is estimated using market rates currently being offered on loans with similar terms and credit quality. Judgment is required in interpreting market data to develop these estimates of fair value. Accordingly, the estimates presented herein are not necessarily indicative of the amounts that we could realize in a current market exchange.

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- Definition Tabular disclosure of financial instrument measured at fair value on recurring or nonrecurring basis. Includes, but is not limited to, instrument classified in shareholders' equity. + 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 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 100 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-100 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-3 + Details
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- Definition Tabular disclosure of information pertaining to carrying amount and estimated fair value of short-term and long-term debt instruments or arrangements, including but not limited to, identification of terms, features, and collateral requirements. + References No definition available. + Details
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