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PENSION AND OTHER POSTRETIREMENT PLANS - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Non-cash charge (in excess of) |  |  | $ 0 | $ (24,242) | $ (35,706)
Contribution plan expense |  |  | 13,032 | 13,297 | 12,442
DB Plan |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Employer contributions |  | $ 35,706 |  |  |
Benefit payments |  | 185,958 |  |  |
Settlement |  | $ 56,274 |  |  |
Non-cash charge (in excess of) |  |  |  |  | 30,856
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] |  |  |  |  |
Employer contributions |  |  | 584 | 24,840 |
Benefit payments |  |  | 584 | 598 |
Settlement |  |  | 0 | 24,242 |
Non-cash charge (in excess of) |  |  | 0 | 1,271 | 30,856
Accumulated benefit obligation |  |  | 14,712 | 12,896 |
Other Postretirement |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Employer contributions |  |  | 513 | 517 |
Benefit payments |  |  | 513 | 517 |
Settlement |  |  | 0 | 0 |
Non-cash charge (in excess of) |  |  | $ 0 | 0 | $ 0
Per capita cost of health care benefits assumed for next fiscal year (as a percent) |  |  | 7.00% |  |
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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