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Retirement Plan and Other Post-Retirement Benefits (Tables)
 12 Months Ended
Sep. 30, 2025
Retirement Benefits [Abstract]  
Schedule of Benefit Obligations, Plan Assets and Funded Status
Reconciliations of the Benefit Obligations, Plan Assets and Funded Status, as well as the components of Net Periodic Benefit Cost and the Weighted Average Assumptions of the Retirement Plan and other post-retirement benefits are shown in the tables below. The components of net periodic benefit cost other than service cost are presented in Other Income (Deductions) on the Consolidated Statements of Income. The date used to measure the Benefit Obligations, Plan Assets and Funded Status is September 30 for fiscal years 2025, 2024 and 2023.
 Retirement PlanOther Post-Retirement Benefits
 Year Ended September 30Year Ended September 30
 202520242023202520242023
 (Thousands)
Change in Benefit Obligation
Benefit Obligation at Beginning of Period
$822,306$768,750$813,828$321,025$274,278$299,283
Service Cost4,0924,1975,187519434587
Interest Cost36,89243,55842,51614,50115,56115,648
Plan Participants’ Contributions———3,5973,4013,297
Retiree Drug Subsidy Receipts———1,5141,2082,969
Actuarial (Gain) Loss(17,232)72,016(27,313)17,07254,443(20,789)
Benefits Paid(66,395)(66,215)(65,468)(27,644)(28,300)(26,717)
Benefit Obligation at End of Period
$779,663$822,306$768,750$330,584$321,025$274,278
Change in Plan Assets
Fair Value of Assets at Beginning of Period
$823,985$784,712$845,205$496,065$455,702$461,438
Actual Return on Plan Assets20,527105,4884,97523,49464,78317,449
Employer Contributions———594479235
Plan Participants’ Contributions———3,5973,4013,297
Benefits Paid(66,395)(66,215)(65,468)(27,644)(28,300)(26,717)
Fair Value of Assets at End of Period
$778,117$823,985$784,712$496,106$496,065$455,702
Net Amount Recognized at End of Period (Funded Status)
$(1,546)$1,679$15,962$165,522$175,040$181,424
Amounts Recognized in the Balance Sheets Consist of:
Non-Current Liabilities$(1,546)$—$—$(3,706)$(3,511)$(2,915)
Non-Current Assets—1,67915,962169,228178,551184,339
Net Amount Recognized at End of Period
$(1,546)$1,679$15,962$165,522$175,040$181,424
Accumulated Benefit Obligation$765,747$804,916$751,912N/AN/AN/A
Weighted Average Assumptions Used to Determine Benefit Obligation at September 30
Discount Rate5.28 %4.97 %5.99 %5.30 %4.98 %5.99 %
Rate of Compensation Increase4.60 %4.60 %4.60 %4.60 %4.60 %4.60 %
 Retirement PlanOther Post-Retirement Benefits
 Year Ended September 30Year Ended September 30
 202520242023202520242023
 (Thousands)
Components of Net Periodic Benefit Cost
Service Cost$4,092$4,197$5,187$519$434$587
Interest Cost36,89243,55842,51614,50115,56115,648
Expected Return on Plan Assets(58,587)(68,343)(66,593)(26,144)(26,642)(25,612)
Amortization of Prior Service Cost (Credit)
302362436(429)(429)(429)
Recognition of Actuarial (Gain) Loss(1)6,481(1,339)(7,680)37(2,266)(8,755)
Net Amortization and Deferral for Regulatory Purposes
(1,375)16,23121,512(3,857)8,75915,157
Net Periodic Benefit Income$(12,195)$(5,334)$(4,622)$(15,373)$(4,583)$(3,404)
Weighted Average Assumptions Used to Determine Net Periodic Benefit Cost at September 30
Effective Discount Rate for Benefit Obligations
4.97 %5.99 %5.57 %4.98 %5.99 %5.56 %
Effective Rate for Interest on Benefit Obligations
4.68 %5.93 %5.45 %4.69 %5.93 %5.45 %
Effective Discount Rate for Service Cost
5.14 %6.01 %5.49 %5.21 %5.99 %5.35 %
Effective Rate for Interest on Service Cost
4.96 %5.98 %5.53 %5.14 %6.01 %5.47 %
Expected Return on Plan Assets6.60 %7.40 %6.90 %5.40 %6.00 %5.70 %
Rate of Compensation Increase4.60 %4.60 %4.60 %4.60 %4.60 %4.60 %
(1)Distribution Corporation’s New York jurisdiction calculates the amortization of the actuarial loss on a vintage year basis over 10 years, as mandated by the NYPSC. All the other subsidiaries of the Company utilize the corridor approach.
Schedule of Cumulative Amounts Recognized in Accumulated Other Comprehensive Income (Loss) and Regulatory Assets and Liabilities
The cumulative amounts recognized in accumulated other comprehensive income (loss), regulatory assets, and regulatory liabilities through fiscal 2025, as well as the changes in such amounts during 2025, are presented in the table below:
Retirement
Plan		Other
Post-Retirement
Benefits		Non-Qualified
Benefit Plans
 (Thousands)
Amounts Recognized in Accumulated Other Comprehensive Income (Loss), Regulatory Assets and Regulatory Liabilities(1)
Net Actuarial Loss$(178,675)$(19,813)$(13,353)
Prior Service (Cost) Credit(1,372)257 — 
Net Amount Recognized$(180,047)$(19,556)$(13,353)
Changes to Accumulated Other Comprehensive Income (Loss), Regulatory Assets and Regulatory Liabilities Recognized During Fiscal 2025(1)
Increase in Actuarial Loss, excluding amortization(2)$(20,828)$(19,722)$(1,061)
Change due to Amortization of Actuarial Loss6,481 37 1,101 
Prior Service (Cost) Credit302 (429)— 
Net Change$(14,045)$(20,114)$40 
(1)Amounts presented are shown before recognizing deferred taxes.
(2)Amounts presented include the impact of actuarial gains/losses related to return on assets, as well as the Actuarial Loss amounts presented in the Change in Benefit Obligation.
Schedule of Expected Benefit Payments
The estimated gross other post-retirement benefit payments and gross amount of Medicare Part D prescription drug subsidy receipts are as follows (dollars in thousands):
Benefit PaymentsSubsidy Receipts
2026$26,899 $(1,560)
2027$27,556 $(1,574)
2028$28,060 $(1,577)
2029$28,344 $(1,577)
2030$28,406 $(1,568)
2031 through 2035
$135,297 $(7,536)
Schedule of Health Care Cost Trend Rates
Assumed health care cost trend rates as of September 30 were:
202520242023
Rate of Medical Cost Increase for Pre Age 65 Participants7.25 %(1)6.25 %(2)6.25 %(3)
Rate of Medical Cost Increase for Post Age 65 Participants5.75 %(1)5.75 %(2)5.00 %(3)
Annual Rate of Increase in the Per Capita Cost of Covered Prescription Drug Benefits
11.75 %(1)10.25 %(2)6.85 %(3)
Annual Rate of Increase in the Per Capita Medicare Part B Reimbursement
5.75 %(1)5.75 %(2)5.00 %(3)
Annual Rate of Increase in the Per Capita Medicare Part D Subsidy
4.00 %(1)4.00 %(2)6.60 %(3)
(1)It was assumed that this rate would gradually decline to 4% by 2050.
(2)It was assumed that this rate would gradually decline to 4% by 2049.
(3)It was assumed that this rate would gradually decline to 4% by 2048.
Schedule of Fair Value of Plan Assets Below is a listing of the major categories of plan assets held as of September 30, 2025 and 2024, as well as the associated level within the fair value hierarchy in which the fair value measurements in their entirety fall, based on the lowest level input that is significant to the fair value measurement in its entirety (dollars in thousands):
At September 30, 2025
Total
Fair Value		Level 1Level 2Level 3Measured
at NAV(6)
Retirement Plan Investments
Domestic Equities(1)$116 $116 $— $— $— 
Global Equities(2)79,470 — — — 79,470 
Domestic Fixed Income(3)(7)645,955 — 596,905 — 49,050 
International Fixed Income(4)9,609 — 9,609 — — 
Real Estate (5)102,373 — — — 102,373 
Cash Held in Collective Trust Funds34,077 — — — 34,077 
Total Retirement Plan Investments871,600 116 606,514 — 264,970 
401(h) Investments(86,093)(12)(60,379)— (25,702)
Total Retirement Plan Investments (excluding 401(h) Investments)
$785,507 $104 $546,135 $— $239,268 
Miscellaneous Accruals, Interest Receivables, and Non-Interest Cash
(7,390)
Total Retirement Plan Assets$778,117 
At September 30, 2024
Total
Fair Value		Level 1Level 2Level 3Measured
at NAV(6)
Retirement Plan Investments
Domestic Equities(1)$37,984 $37,984 $— $— $— 
Global Equities(2)38,234 — — — 38,234 
Domestic Fixed Income(3)(7)681,755 — 633,600 — 48,155 
International Fixed Income(4)8,587 — 8,587 — — 
Real Estate (5)109,383 — — — 109,383 
Cash Held in Collective Trust Funds41,709 — — — 41,709 
Total Retirement Plan Investments917,652 37,984 642,187 — 237,481 
401(h) Investments(83,682)(3,500)(59,166)— (21,016)
Total Retirement Plan Investments (excluding 401(h) Investments)
$833,970 $34,484 $583,021 $— $216,465 
Miscellaneous Accruals, Interest Receivables, and Non-Interest Cash
(9,985)
Total Retirement Plan Assets$823,985 
(1)Domestic Equities include mostly collective trust funds, common stock, and exchange traded funds.
(2)Global Equities are comprised of collective trust funds.
(3)Domestic Fixed Income securities include mostly collective trust funds, corporate/government bonds and mortgages, and exchange traded funds.
(4)International Fixed Income securities are comprised mostly of corporate/government bonds.
(5)Real Estate consists of investments held in a collective trust fund and a partnership.
(6)Reflects the authoritative guidance related to investments measured at net asset value (NAV).
(7)Domestic Fixed Income securities include $6.2 million and $8.5 million of derivative instruments used as part of the Company’s overall liability-driven investment strategy as a way to assist in matching the duration of the assets of the Retirement Plan investments with its liability to plan participants as of September 30, 2025 and September 30, 2024, respectively.
At September 30, 2025
Total
Fair Value		Level 1Level 2Level 3Measured
at NAV(1)
Other Post-Retirement Benefit Assets held in VEBA Trusts
Collective Trust Funds — Global Equities
$232,395 $— $— $— $232,395 
Exchange Traded Funds — Fixed Income165,601 165,601 — — — 
Cash Held in Collective Trust Funds12,302 — — — 12,302 
Total VEBA Trust Investments410,298 165,601 — — 244,697 
401(h) Investments86,093 12 60,379 — 25,702 
Total Investments (including 401(h) Investments)
$496,391 $165,613 $60,379 $— $270,399 
Miscellaneous Accruals (including Current and Deferred Taxes, Claims Incurred But Not Reported, Administrative)(285)
Total Other Post-Retirement Benefit Assets
$496,106 
At September 30, 2024
Total
Fair Value		Level 1Level 2Level 3Measured
at NAV(1)
Other Post-Retirement Benefit Assets held in VEBA Trusts
Collective Trust Funds — Global Equities$82,814 $— $— $— $82,814 
Exchange Traded Funds — Fixed Income314,052 314,052 — — — 
Cash Held in Collective Trust Funds14,274 — — — 14,274 
Total VEBA Trust Investments411,140 314,052 — — 97,088 
401(h) Investments83,682 3,500 59,166 — 21,016 
Total Investments (including 401(h) Investments)
$494,822 $317,552 $59,166 $— $118,104 
Miscellaneous Accruals (Including Current and Deferred Taxes, Claims Incurred But Not Reported, Administrative)
1,243 
Total Other Post-Retirement Benefit Assets
$496,065 
(1)Reflects the authoritative guidance related to investments measured at net asset value (NAV).