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Fair Value Measurements (Tables)
 6 Months Ended
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 companies27,787 — — — 27,787 
Bond mutual funds40,955 — — — 40,955 
Bonds (2)
— 37,118 — — 37,118 
Money market funds— 3,189 — — 3,189 
Total debt and equity securities68,742 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 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 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, 2025September 30, 2024
 (In thousands)
Carrying Amount$8,435,000 $7,785,000 
Fair Value$7,568,621 $7,337,936