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Fair Value Measurements (Tables)
 12 Months Ended
Sep. 30, 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 September 30, 2025 and 2024. As required under authoritative accounting literature, 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		September 30, 2025
 (In thousands)
Assets:
Financial instruments$— $9,897 $— $— $9,897 
Debt and equity securities
Registered investment companies26,463 — — — 26,463 
Bond mutual funds42,106 — — — 42,106 
Bonds (2)
— 42,754 — — 42,754 
Money market funds— 3,615 — — 3,615 
Total debt and equity securities68,569 46,369 — — 114,938 
Total assets$68,569 $56,266 $— $— $124,835 
Liabilities:
Financial instruments$— $6,485 $— $— $6,485 
Quoted
Prices in
Active
Markets
(Level 1)
Significant
Other
Observable
Inputs
(Level 2)(1)
Significant
Other
Unobservable
Inputs
(Level 3)		Netting and
Cash
Collateral		September 30, 2024
 (In thousands)
Assets:
Financial instruments$— $96,288 $— $— $96,288 
Debt and equity securities
Registered investment companies28,311 — — — 28,311 
Bond mutual funds40,341 — — — 40,341 
Bonds (2)
— 39,142 — — 39,142 
Money market funds— 2,800 — — 2,800 
Total debt and equity securities68,652 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 which 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 Value and Fair Value of Our Long-term Debt The following table presents the carrying value and fair value of our long-term debt, excluding finances leases, debt issuance costs and original issue premium or discount, as of September 30, 2025:
 September 30, 2025
 (In thousands)
Carrying Amount$8,935,000 
Fair Value$8,272,978