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Fair Value Measurements (Tables)
 9 Months Ended
Jun. 30, 2024
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 June 30, 2024 and September 30, 2023. 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		June 30, 2024
 (In thousands)
Assets:
Financial instruments$— $381,220 $— $— $381,220 
Debt and equity securities
Registered investment companies26,948 — — — 26,948 
Bond mutual funds39,253 — — — 39,253 
Bonds (2)
— 38,369 — — 38,369 
Money market funds— 3,791 — — 3,791 
Total debt and equity securities66,201 42,160 — — 108,361 
Total assets$66,201 $423,380 $— $— $489,581 
Liabilities:
Financial instruments$— $5,977 $— $— $5,977 

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, 2023
 (In thousands)
Assets:
Financial instruments$— $385,664 $— $— $385,664 
Debt and equity securities
Registered investment companies26,685 — — — 26,685 
Bond mutual funds37,573 — — — 37,573 
Bonds (2)
— 35,507 — — 35,507 
Money market funds— 4,837 — — 4,837 
Total debt and equity securities64,258 40,344 — — 104,602 
Total assets$64,258 $426,008 $— $— $490,266 
Liabilities:
Financial instruments$— $15,408 $— $— $15,408 
 
(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 June 30, 2024 and September 30, 2023:
 June 30, 2024September 30, 2023
 (In thousands)
Carrying Amount$7,785,000 $6,560,000 
Fair Value$6,892,431 $5,402,591