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Interim Pension and Other Postretirement Benefit Plan Information (Tables)
 9 Months Ended
Jun. 30, 2024
Retirement Benefits, Description [Abstract]  
Schedule of Net Benefit Costs
 Three Months Ended June 30
 Pension BenefitsOther Benefits
 2024202320242023
 (In thousands)
Components of net periodic pension cost:
Service cost$2,405 $2,915 $1,507 $1,546 
Interest cost (1)
7,430 7,265 3,509 3,478 
Expected return on assets (1)
(7,202)(7,278)(3,128)(2,804)
Amortization of prior service cost (credit) (1)
— (30)(3,260)(3,285)
Amortization of actuarial (gain) loss (1)
97 178 (2,718)(1,863)
Settlements (1)
— 1,030 — — 
Net periodic pension cost$2,730 $4,080 $(4,090)$(2,928)
 Nine Months Ended June 30
 Pension BenefitsOther Benefits
2024202320242023
 (In thousands)
Components of net periodic pension cost:
Service cost$7,199 $8,731 $4,521 $4,637 
Interest cost (1)
22,356 21,915 10,526 10,433 
Expected return on assets (1)
(21,606)(21,835)(9,383)(8,411)
Amortization of prior service cost (credit) (1)
— (91)(9,780)(9,856)
Amortization of actuarial (gain) loss (1)
313 506 (8,154)(5,589)
Settlements (1)
776 1,030 — — 
Net periodic pension cost$9,038 $10,256 $(12,270)$(8,786)
(1)    The components of net periodic cost other than the service cost component are included in the line item other non-operating expense in the condensed consolidated statements of comprehensive income or are capitalized on the condensed consolidated balance sheets as a regulatory asset or liability, as described in Note 2 to the consolidated financial statements in our Annual Report on Form 10-K for the fiscal year ended September 30, 2023.