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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 and Liabilities Measured on Recurring Basis | The following tables summarize, by level within the fair value hierarchy, our assets and liabilities that were accounted for at fair value on a recurring basis as of March 31, 2025 and September 30, 2024. Assets and liabilities are categorized in their entirety based on the lowest level of input that is significant to the fair value measurement.
| Quoted Prices in Active Markets (Level 1) |  | Significant Other Observable Inputs (Level 2)(1) |  | Significant Other Unobservable Inputs (Level 3) |  | Netting and Cash Collateral |  | March 31, 2025
| (In thousands)
Assets: |  |  |  |  |  |  |  |  |
Financial instruments | $ | — |  |  | $ | 123,209 |  |  | $ | — |  |  | $ | — |  |  | $ | 123,209 |
Debt and equity securities |  |  |  |  |  |  |  |  |
Registered investment companies | 27,787 |  |  | — |  |  | — |  |  | — |  |  | 27,787 |
Bond mutual funds | 40,955 |  |  | — |  |  | — |  |  | — |  |  | 40,955 |
Bonds (2) | — |  |  | 37,118 |  |  | — |  |  | — |  |  | 37,118 |
Money market funds | — |  |  | 3,189 |  |  | — |  |  | — |  |  | 3,189 |
Total debt and equity securities | 68,742 |  |  | 40,307 |  |  | — |  |  | — |  |  | 109,049 |
Total assets | $ | 68,742 |  |  | $ | 163,516 |  |  | $ | — |  |  | $ | — |  |  | $ | 232,258 |
Liabilities: |  |  |  |  |  |  |  |  |
Financial instruments | $ | — |  |  | $ | 561 |  |  | $ | — |  |  | $ | — |  |  | $ | 561 |
| Quoted Prices in Active Markets (Level 1) |  | Significant Other Observable Inputs (Level 2)(1) |  | Significant Other Unobservable Inputs (Level 3) |  | Netting and Cash Collateral |  | September 30, 2024
| (In thousands)
Assets: |  |  |  |  |  |  |  |  |
Financial instruments | $ | — |  |  | $ | 96,288 |  |  | $ | — |  |  | $ | — |  |  | $ | 96,288 |
Debt and equity securities |  |  |  |  |  |  |  |  |
Registered investment companies | 28,311 |  |  | — |  |  | — |  |  | — |  |  | 28,311 |
Bond mutual funds | 40,341 |  |  | — |  |  | — |  |  | — |  |  | 40,341 |
Bonds (2) | — |  |  | 39,142 |  |  | — |  |  | — |  |  | 39,142 |
Money market funds | — |  |  | 2,800 |  |  | — |  |  | — |  |  | 2,800 |
Total debt and equity securities | 68,652 |  |  | 41,942 |  |  | — |  |  | — |  |  | 110,594 |
Total assets | $ | 68,652 |  |  | $ | 138,230 |  |  | $ | — |  |  | $ | — |  |  | $ | 206,882 |
Liabilities: |  |  |  |  |  |  |  |  |
Financial instruments | $ | — |  |  | $ | 7,637 |  |  | $ | — |  |  | $ | — |  |  | $ | 7,637 |
(1)Our Level 2 measurements consist of over-the-counter options and swaps, which are valued using a market-based approach in which observable market prices are adjusted for criteria specific to each instrument, such as the strike price, notional amount or basis differences, municipal and corporate bonds, which are valued based on the most recent available quoted market prices and money market funds that are valued at cost. (2)Our investments in bonds are considered available-for-sale debt securities in accordance with current accounting guidance.
Schedule of Carrying Values and Estimated Fair Values of Long-term Debt | The following table presents the carrying value and fair value of our long-term debt, excluding finance leases, debt issuance costs and original issue premium or discount, as of March 31, 2025 and September 30, 2024:
| March 31, 2025 |  | September 30, 2024
| (In thousands)
Carrying Amount | $ | 8,435,000 |  |  | $ | 7,785,000 |
Fair Value | $ | 7,568,621 |  |  | $ | 7,337,936 |

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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + 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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