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PENSION AND OTHER POSTRETIREMENT PLANS - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2022 | Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Non-cash charge (in excess of) |  | $ 0 | $ 0 | $ (24,242)
Contribution plan expense |  | 11,127 | 13,032 | 13,297
SERP, DB, and ORRP Plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Benefit payments | $ 24,242 |  |  |
Non-cash charge (in excess of) |  |  |  | 1,271
Pension |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Benefit payments |  | 573 | 584 |
Non-cash charge (in excess of) |  | 0 | 0 | 1,271
Accumulated benefit obligation |  | 14,034 | 14,712 |
Other Postretirement |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Benefit payments |  | 346 | 513 |
Non-cash charge (in excess of) |  | $ 0 | 0 | 0
Per capita cost of health care benefits assumed for next fiscal year (as a percent) |  | 8.00% |  |
Ultimate health care cost trend rate (as a percent) |  | 4.00% |  |
Nonqualified Plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Contribution plan expense |  |  | $ 700 | $ 1,385

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