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v3.25.3

PENSION AND OTHER POSTRETIREMENT PLANS - Weighted-Average Assumptions for Principal Retirement and Other Postretirement Benefit Plans (Details) | 12 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023
Pension |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Discount rate | 4.04% | 3.51% | 4.13%
Other Postretirement |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Discount rate | 5.39% | 4.99% | 5.86%

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