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Retirement Plan and Other Post-Retirement Benefits - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Net periodic benefit cost (income) | $ 4,600 | $ 9,500 | $ 8,300 |
Accumulated Benefit Obligation | 50,900 | 57,500 | 58,500 |
Projected benefit obligation | $ 58,400 | $ 66,000 | $ 69,500 |
Discount rate (as a percent) | 4.86% | 4.71% | 5.91% |
Rate of compensation increase (as a percent) | 8.00% | 8.00% | 8.00% |
Pre-tax decrease to accumulated other comprehensive income | $ (59,398) | $ 55,235 | $ 788,876 |
Defined Benefit Plan, Tax Status [Extensible Enumeration] | Non-Qualified Benefit Plans | Non-Qualified Benefit Plans | Non-Qualified Benefit Plans |
Other Accruals and Current Liabilities |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Projected benefit obligation | $ 11,600 | $ 14,100 | $ 13,100 |
Other Liabilities |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Projected benefit obligation | 46,800 | 51,900 | 56,400 |
Retirement Savings Account |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Costs recognized | 7,100 | 6,500 | 5,700 |
Tax-Deferred Savings Plans |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Costs recognized | 9,800 | 9,000 | 8,200 |
Retirement Plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Net periodic benefit cost (income) | (12,195) | (5,334) | (4,622) |
Accumulated Benefit Obligation | 765,747 | 804,916 | 751,912 |
Projected benefit obligation | $ 779,663 | $ 822,306 | $ 768,750 | $ 813,828
Discount rate (as a percent) | 5.28% | 4.97% | 5.99% |
Rate of compensation increase (as a percent) | 4.60% | 4.60% | 4.60% |
Annual contribution expected for next fiscal year | $ 0 |  |  |
Expected future benefit payments in 2026 | 67,600 |  |  |
Expected future benefit payments in 2027 | 66,900 |  |  |
Expected future benefit payments in 2028 | 66,100 |  |  |
Expected future benefit payments in 2029 | 65,100 |  |  |
Expected future benefit payments 2030 | 64,000 |  |  |
Expected future benefit payments 2031 through 2035 | 297,800 |  |  |
Employer contributions | $ 0 | $ 0 | $ 0 |
Expected long term rate of return on plan assets (as a percent) | 6.60% | 7.40% | 6.90% |
Retirement Plan | Scenario, Plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Expected long term rate of return on plan assets (as a percent) | 7.10% |  |  |
Retirement Plan | Other Actuarial Experience |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Increase (decrease) in benefit obligation | $ 4,200 |  |  |
Retirement Plan | Discount Rate Change |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Increase (decrease) in benefit obligation | (21,400) | $ 69,600 | $ (28,400) |
Non-Qualified Benefit Plans, Other Post-Retirement Benefit Plan and Retirement Plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Increase to other regulatory assets | 23,800 |  |  |
Pre-tax decrease to accumulated other comprehensive income | 10,300 |  |  |
Other Post-Retirement Benefits |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Net periodic benefit cost (income) | (15,373) | (4,583) | (3,404) |
Projected benefit obligation | $ 330,584 | $ 321,025 | $ 274,278 | $ 299,283
Discount rate (as a percent) | 5.30% | 4.98% | 5.99% |
Rate of compensation increase (as a percent) | 4.60% | 4.60% | 4.60% |
Expected future benefit payments in 2026 | $ 26,899 |  |  |
Expected future benefit payments in 2027 | 27,556 |  |  |
Expected future benefit payments in 2028 | 28,060 |  |  |
Expected future benefit payments in 2029 | 28,344 |  |  |
Expected future benefit payments 2030 | 28,406 |  |  |
Expected future benefit payments 2031 through 2035 | 135,297 |  |  |
Employer contributions | $ 594 | $ 479 | $ 235 |
Expected long term rate of return on plan assets (as a percent) | 5.40% | 6.00% | 5.70% |
Other Post-Retirement Benefits | Scenario, Plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Expected long term rate of return on plan assets (as a percent) | 6.10% |  |  |
Other Post-Retirement Benefits | Other Actuarial Experience |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Increase (decrease) in benefit obligation | $ 8,800 | $ 1,200 | $ (12,900) |
Other Post-Retirement Benefits | Discount Rate Change |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Increase (decrease) in benefit obligation | (9,900) | 28,100 | (10,700) |
Other Post-Retirement Benefits | Mortality Improvement Projection Scale |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Increase (decrease) in benefit obligation |  |  | (400) |
Other Post-Retirement Benefits | Health Care Cost Trend Rates |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Increase (decrease) in benefit obligation | 18,200 | $ 25,200 | $ 3,200 |
Other Than VEBA Trust And 401(h) Accounts |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Employer contributions | 600 |  |  |
VEBA Trust |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Annual contribution expected for next fiscal year | 0 |  |  |
Employer contributions | $ 0 |  |  |

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