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Retirement and Postretirement Employee Benefit Plans (Tables) | 12 Months Ended
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Sep. 30, 2025
Retirement Benefits [Abstract] |
Schedule of Net Periodic Benefit Cost Not yet Recognized | Additionally, the amounts that have not yet been recognized in net periodic pension cost that have been recorded as regulatory assets or liabilities are as follows:
| Employee Pension Plan |  | Supplemental Executive Retirement Plans |  | Postretirement Plan |  | Total
| (In thousands)
September 30, 2025 |  |  |  |  |  |  |
Unrecognized prior service credit | $ | — |  |  | $ | — |  |  | $ | (9,984) |  |  | $ | (9,984) |
Unrecognized actuarial (gain) loss | (179,351) |  |  | 17,661 |  |  | (116,690) |  |  | (278,380) |
| $ | (179,351) |  |  | $ | 17,661 |  |  | $ | (126,674) |  |  | $ | (288,364) |
September 30, 2024 |  |  |  |  |  |  |
Unrecognized prior service credit | $ | — |  |  | $ | — |  |  | $ | (24,897) |  |  | $ | (24,897) |
Unrecognized actuarial (gain) loss | (126,989) |  |  | 16,136 |  |  | (111,500) |  |  | (222,353) |
| $ | (126,989) |  |  | $ | 16,136 |  |  | $ | (136,397) |  |  | $ | (247,250) |
Schedule of Allocation of Plan Assets | The following table presents asset allocation information for the Master Trust as of September 30, 2025 and 2024.
| Targeted Allocation Range |  | Actual Allocation September 30
Security Class | 2025 |  | 2024
Domestic equities | 35%-55% |  | 43.6% |  | 42.8%
International equities | 10%-20% |  | 15.5% |  | 15.8%
Fixed income | 5%-45% |  | 24.3% |  | 22.3%
Company stock | 0%-15% |  | 14.0% |  | 16.7%
Other assets | 0%-20% |  | 2.6% |  | 2.4%
The following table presents asset allocation information for the Retiree Medical Plan assets as of September 30, 2025 and 2024.
| Actual Allocation September 30
Security Class | 2025 |  | 2024
Diversified investment funds | 98.6% |  | 97.8%
Cash and cash equivalents | 1.4% |  | 2.2%
Schedule of Assumptions Used | Additional assumptions are presented in the following table:
| Pension Asset |  | Pension Cost
| 2025 |  | 2024 |  | 2025 |  | 2024 |  | 2023
Discount rate | 5.45 | % |  | 5.02 | % |  | 5.02 | % |  | 6.10 | % |  | 5.66 | %
Rate of compensation increase | 3.50 | % |  | 3.50 | % |  | 3.50 | % |  | 3.50 | % |  | 3.50 | %
Expected return on plan assets | 6.50 | % |  | 6.50 | % |  | 6.50 | % |  | 6.25 | % |  | 6.25 | %
Interest crediting rate (1) | 4.69 | % |  | 4.69 | % |  | 4.69 | % |  | 4.69 | % |  | 4.69 | %
(1) The interest crediting rate assumption for the development of the fiscal 2025 pension asset is 4.73% for calendar year 2026, then reverting back to 4.69% for all future years. These assumptions are presented in the following table:
| Pension Liability |  | Pension Cost
| 2025 |  | 2024 |  | 2025 |  | 2024 |  | 2023
Discount rate (1) | 5.14 | % |  | 4.92 | % |  | 4.92 | % |  | 5.85 | % |  | 5.50 | %
Rate of compensation increase | 3.50 | % |  | 3.50 | % |  | 3.50 | % |  | 3.50 | % |  | 3.50 | %
Interest crediting rate (2) | 4.69 | % |  | 4.69 | % |  | 4.69 | % |  | 4.69 | % |  | 4.69 | %
(1) Reflects a weighted average discount rate for pension cost for fiscal 2024 and 2023 due to the settlements during the year. (2) The interest crediting rate assumption for the development of the fiscal 2025 pension liability is 4.73% for calendar year 2026, then reverting back to 4.69% for all future years. The assumptions are presented in the following table:
| Postretirement Asset |  | Postretirement Cost
| 2025 |  | 2024 |  | 2025 |  | 2024 |  | 2023
Discount rate | 5.47 | % |  | 5.01 | % |  | 5.01 | % |  | 6.06 | % |  | 5.61 | %
Expected return on plan assets | 5.14 | % |  | 5.14 | % |  | 5.14 | % |  | 4.94 | % |  | 4.94 | %
Initial trend rate | 7.00 | % |  | 6.75 | % |  | 6.75 | % |  | 6.50 | % |  | 6.25 | %
Ultimate trend rate | 5.00 | % |  | 5.00 | % |  | 5.00 | % |  | 5.00 | % |  | 4.75 | %
Ultimate trend reached in | 2034 |  | 2032 |  | 2032 |  | 2030 |  | 2029
Schedule of Changes in Projected Benefit Obligations, Fair Value of Plan Assets, and Funded Status of Plan | The following table presents the Pension Plan’s accumulated benefit obligation, projected benefit obligation, and funded status as of September 30, 2025 and 2024:
| 2025 |  | 2024
| (In thousands)
Accumulated benefit obligation | $ | 428,845 |  |  | $ | 448,353 |
Change in projected benefit obligation: |  |  |
Benefit obligation at beginning of year | $ | 470,902 |  |  | $ | 431,560 |
Service cost | 10,047 |  |  | 9,546 |
Interest cost | 23,164 |  |  | 25,731 |
Actuarial (gain) loss | (18,133) |  |  | 44,205 |
Benefits paid | (35,556) |  |  | (40,140) |
Benefit obligation at end of year | 450,424 |  |  | 470,902 |
Change in plan assets: |  |  |
Fair value of plan assets at beginning of year | 595,212 |  |  | 502,412 |
Actual return on plan assets | 64,847 |  |  | 127,940 |
Employer contributions | — |  |  | 5,000 |
Benefits paid | (35,556) |  |  | (40,140) |
Fair value of plan assets at end of year | 624,503 |  |  | 595,212 |
Reconciliation: |  |  |
Funded status | 174,079 |  |  | 124,310 |
Unrecognized prior service cost | — |  |  | — |
Unrecognized net loss | — |  |  | — |
Net amount recognized | $ | 174,079 |  |  | $ | 124,310 |
The following table presents the Supplemental Plans’ accumulated benefit obligation, projected benefit obligation, and funded status as of September 30, 2025 and 2024:
| 2025 |  | 2024
| (In thousands)
Accumulated benefit obligation | $ | 73,570 |  |  | $ | 71,003 |
Change in projected benefit obligation: |  |  |
Benefit obligation at beginning of year | $ | 71,944 |  |  | $ | 75,898 |
Service cost | 1,302 |  |  | 55 |
Interest cost | 3,488 |  |  | 4,024 |
Actuarial loss | 2,547 |  |  | 5,853 |
Benefits paid | (4,761) |  |  | (4,285) |
Settlements | — |  |  | (9,601) |
Benefit obligation at end of year | 74,520 |  |  | 71,944 |
Change in plan assets: |  |  |
Fair value of plan assets at beginning of year | — |  |  | — |
Employer contribution | — |  |  | — |
Benefits paid | — |  |  | — |
Settlements | — |  |  | — |
Fair value of plan assets at end of year | — |  |  | — |
Reconciliation: |  |  |
Funded status | (74,520) |  |  | (71,944) |
Unrecognized prior service cost | — |  |  | — |
Unrecognized net loss | — |  |  | — |
Accrued pension cost | $ | (74,520) |  |  | $ | (71,944) |
The following table presents the Retiree Medical Plan’s benefit obligation and funded status as of September 30, 2025 and 2024:
| 2025 |  | 2024
| (In thousands)
Change in benefit obligation: |  |  |
Benefit obligation at beginning of year | $ | 269,391 |  |  | $ | 234,004 |
Service cost | 8,132 |  |  | 6,028 |
Interest cost | 13,463 |  |  | 14,034 |
Plan participants’ contributions | 1,993 |  |  | 2,102 |
Actuarial (gain) loss | (8,733) |  |  | 31,135 |
Benefits paid | (19,065) |  |  | (17,912) |
Plan amendments | 1,873 |  |  | — |
Benefit obligation at end of year | 267,054 |  |  | 269,391 |
Change in plan assets: |  |  |
Fair value of plan assets at beginning of year | 300,692 |  |  | 255,800 |
Actual return on plan assets | 21,500 |  |  | 47,857 |
Employer contributions | — |  |  | — |
Benefits paid | (2,808) |  |  | (2,965) |
Fair value of plan assets at end of year | 319,384 |  |  | 300,692 |
Reconciliation: |  |  |
Funded status | 52,330 |  |  | 31,301 |
Unrecognized transition obligation | — |  |  | — |
Unrecognized prior service cost | — |  |  | — |
Unrecognized net loss | — |  |  | — |
Accrued postretirement cost | $ | 52,330 |  |  | $ | 31,301 |
Schedule of Net Benefit Costs | Net periodic pension cost for the Pension Plan for fiscal 2025, 2024, and 2023 is presented in the following table.
| Fiscal Year Ended September 30
| 2025 |  | 2024 |  | 2023
| (In thousands)
Components of net periodic pension cost: |  |  |  |  |
Service cost | $ | 10,047 |  |  | $ | 9,546 |  |  | $ | 10,805 |
Interest cost (1) | 23,164 |  |  | 25,731 |  |  | 24,924 |
Expected return on assets (1) | (30,618) |  |  | (28,808) |  |  | (29,113) |
Amortization of prior service credit (1) | — |  |  | — |  |  | (121) |
Recognized actuarial gain (1) | — |  |  | (67) |  |  | — |
Net periodic pension cost | $ | 2,593 |  |  | $ | 6,402 |  |  | $ | 6,495 |
(1) The components of net periodic cost other than the service cost component are included in the line item other non-operating income in the consolidated statements of comprehensive income or are capitalized on the consolidated balance sheets as a regulatory asset or liability, as described in Note 2 to the consolidated financial statements. Net periodic pension cost for the Supplemental Plans for fiscal 2025, 2024, and 2023 is presented in the following table.
| Fiscal Year Ended September 30
| 2025 |  | 2024 |  | 2023
| (In thousands)
Components of net periodic pension cost: |  |  |  |  |
Service cost | $ | 1,302 |  |  | $ | 55 |  |  | $ | 845 |
Interest cost (1) | 3,488 |  |  | 4,024 |  |  | 4,227 |
Recognized actuarial loss (1) | 1,022 |  |  | 501 |  |  | 691 |
Settlements (1) | — |  |  | 1,529 |  |  | 1,030 |
Net periodic pension cost | $ | 5,812 |  |  | $ | 6,109 |  |  | $ | 6,793 |
(1) The components of net periodic cost other than the service cost component are included in the line item other non-operating income in the consolidated statements of comprehensive income or are capitalized on the consolidated balance sheets as a regulatory asset or liability, as described in Note 2 to the consolidated financial statements. Net periodic postretirement cost for the Retiree Medical Plan for fiscal 2025, 2024, and 2023 is presented in the following table.
| Fiscal Year Ended September 30
| 2025 |  | 2024 |  | 2023
| (In thousands)
Components of net periodic postretirement cost: |  |  |  |  |
Service cost | $ | 8,132 |  |  | $ | 6,028 |  |  | $ | 6,183 |
Interest cost (1) | 13,463 |  |  | 14,034 |  |  | 13,911 |
Expected return on assets (1) | (15,325) |  |  | (12,511) |  |  | (11,215) |
Amortization of prior service credit (1) | (13,040) |  |  | (13,040) |  |  | (13,142) |
Recognized actuarial gain (1) | (9,716) |  |  | (10,872) |  |  | (7,452) |
Net periodic postretirement cost | $ | (16,486) |  |  | $ | (16,361) |  |  | $ | (11,715) |
(1) The components of net periodic cost other than the service cost component are included in the line item other non-operating income in the consolidated statements of comprehensive income or are capitalized on the consolidated balance sheets as a regulatory asset or liability, as described in Note 2 to the consolidated financial statements.
Schedule of Employee Pension Plans Investments at Fair Value | In addition to the assets shown below, the Pension Plan had net accounts receivable of $5.1 million and $0.7 million at September 30, 2025 and 2024, which materially approximates fair value due to the short-term nature of these assets.
| Assets at Fair Value as of September 30, 2025
| Level 1 |  | Level 2 |  | Level 3 |  | Total
| (In thousands)
Investments: |  |  |  |  |  |  |
Common stocks | $ | 284,573 |  |  | $ | — |  |  | $ | — |  |  | $ | 284,573 |
Money market funds | — |  |  | 16,293 |  |  | — |  |  | 16,293 |
Registered investment companies | 123,022 |  |  | — |  |  | — |  |  | 123,022 |
Government securities: |  |  |  |  |  |  |
Mortgage-backed securities | — |  |  | 26,101 |  |  | — |  |  | 26,101 |
U.S. treasuries | 15,021 |  |  | 26 |  |  | — |  |  | 15,047 |
Corporate bonds | — |  |  | 32,517 |  |  | — |  |  | 32,517 |
Asset-backed securities | — |  |  | 1,475 |  |  | — |  |  | 1,475 |
Total investments measured at fair value | $ | 422,616 |  |  | $ | 76,412 |  |  | $ | — |  |  | 499,028 |
Investments measured at net asset value: |  |  |  |  |  |  |
Common/collective trusts (1) |  |  |  |  |  |  | 95,558 |
Limited partnerships (1) |  |  |  |  |  |  | 24,843 |
Total investments |  |  |  |  |  |  | $ | 619,429 |
| Assets at Fair Value as of September 30, 2024
| Level 1 |  | Level 2 |  | Level 3 |  | Total
| (In thousands)
Investments: |  |  |  |  |  |  |
Common stocks | $ | 289,301 |  |  | $ | — |  |  | $ | — |  |  | $ | 289,301 |
Money market funds | — |  |  | 14,542 |  |  | — |  |  | 14,542 |
Registered investment companies | 90,086 |  |  | — |  |  | — |  |  | 90,086 |
Government securities: |  |  |  |  |  |  |
Mortgage-backed securities | — |  |  | 24,383 |  |  | — |  |  | 24,383 |
U.S. treasuries | 9,398 |  |  | 27 |  |  | — |  |  | 9,425 |
Corporate bonds | — |  |  | 31,986 |  |  | — |  |  | 31,986 |
Total investments measured at fair value | $ | 388,785 |  |  | $ | 70,938 |  |  | $ | — |  |  | 459,723 |
Investments measured at net asset value: |  |  |  |  |  |  |
Common/collective trusts (1) |  |  |  |  |  |  | 111,103 |
Limited partnerships (1) |  |  |  |  |  |  | 23,665 |
Total investments |  |  |  |  |  |  | $ | 594,491 |
(1) The fair value of our common/collective trusts and limited partnerships are measured using the net asset value per share practical expedient. There are no redemption restrictions, redemption notice periods, or unfunded commitments for these investments. The redemption frequency is daily.
Schedule of Expected Benefit Payments | The following benefit payments for our defined benefit plans, which reflect expected future service, as appropriate, are expected to be paid in the following fiscal years:
| Pension Plan |  | Supplemental Plans
| (In thousands)
2026 | $ | 40,122 |  |  | $ | 6,277 |
2027 | 39,190 |  |  | 9,627 |
2028 | 38,729 |  |  | 28,392 |
2029 | 38,798 |  |  | 3,783 |
2030 | 38,777 |  |  | 3,615 |
2031-2035 | 178,831 |  |  | 31,031 |
The following benefit payments paid by the Company, retirees, and prescription drug subsidies for our Retiree Medical Plan, which reflect expected future service, as appropriate, are expected to be paid in the following fiscal years.
|  | Company Payments |  | Retiree Payments |  | Subsidy Payments |  | Total Postretirement Benefits
|  | (In thousands)
2026 |  | $ | 18,898 |  |  | $ | 2,425 |  |  | $ | — |  |  | $ | 21,323 |
2027 |  | 18,859 |  |  | 2,320 |  |  | — |  |  | 21,179 |
2028 |  | 18,783 |  |  | 2,186 |  |  | — |  |  | 20,969 |
2029 |  | 19,011 |  |  | 2,112 |  |  | — |  |  | 21,123 |
2030 |  | 19,364 |  |  | 2,083 |  |  | — |  |  | 21,447 |
2031-2035 |  | 104,216 |  |  | 10,770 |  |  | — |  |  | 114,986 |
Schedule of Postretirement Benefit Plans Investments at Fair Value | The following tables set forth by level, within the fair value hierarchy, the Retiree Medical Plan’s assets at fair value as of September 30, 2025 and 2024. The methods used to determine fair value for the assets held by the Retiree Medical Plan are fully described in Note 2 to the consolidated financial statements.
| Assets at Fair Value as of September 30, 2025
| Level 1 |  | Level 2 |  | Level 3 |  | Total
| (In thousands)
Investments: |  |  |  |  |  |  |
Money market funds | $ | — |  |  | $ | 4,428 |  |  | $ | — |  |  | $ | 4,428 |
Registered investment companies | 314,956 |  |  | — |  |  | — |  |  | 314,956 |
Total investments measured at fair value | $ | 314,956 |  |  | $ | 4,428 |  |  | $ | — |  |  | $ | 319,384 |
| Assets at Fair Value as of September 30, 2024
| Level 1 |  | Level 2 |  | Level 3 |  | Total
| (In thousands)
Investments: |  |  |  |  |  |  |
Money market funds | $ | — |  |  | $ | 6,633 |  |  | $ | — |  |  | $ | 6,633 |
Registered investment companies | 294,059 |  |  | — |  |  | — |  |  | 294,059 |
Total investments measured at fair value | $ | 294,059 |  |  | $ | 6,633 |  |  | $ | — |  |  | $ | 300,692 |

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- Definition Tabular disclosure of investments of the postretirement benefit plan measured at fair value. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References No definition available. + Details
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- Definition Tabular disclosure of the major categories of plan assets of pension plans and/or other employee benefit plans. This information may include, but is not limited to, the target allocation of plan assets, the fair value of each major category of plan assets, and the level within the fair value hierarchy in which the fair value measurements fall. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 715 -SubTopic 20 -Subparagraph (d)(5) -Name Accounting Standards Codification -Paragraph 1 -Section 50 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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- Definition Tabular disclosure of benefits expected to be paid by pension plans and/or other employee benefit plans in each of the next five fiscal years and in the aggregate for the five fiscal years thereafter. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-5 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 715 -SubTopic 20 -Subparagraph (f) -Name Accounting Standards Codification -Paragraph 1 -Section 50 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (q) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-5 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 715 -SubTopic 20 -Subparagraph (h) -Name Accounting Standards Codification -Paragraph 1 -Section 50 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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- Definition Tabular disclosure of the amounts related to pension plans and/or other employee benefit plans in accumulated other comprehensive income or loss that have not yet been recognized as components of net periodic benefit cost, such as the net gain (loss), net prior service cost or credit, and net transition asset or obligation. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-5 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 715 -SubTopic 20 -Subparagraph (j) -Name Accounting Standards Codification -Paragraph 1 -Section 50 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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