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PENSION AND OTHER POSTRETIREMENT PLANS - Reconciliation of Benefit Obligations, Plan Assets and Funded Status of Pension Plans (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2021 | Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2020
Change in plan assets: |  |  |  |
Fair value, beginning of year | $ 208,344 | $ 208,344 |  |
Benefit payments | (185,958) |  |  |
Employer contributions | 35,706 |  |  |
Settlement | (56,274) |  |  |
Fair value, end of year |  |  | $ 208,344 |
Pension |  |  |  |
Change in benefit obligation: |  |  |  |
Benefit obligation, beginning of year | 293,926 | 293,926 | 318,887 |
Acquisitions |  | 9,829 | 0 |
Service cost |  | 392 | 7,919 | $ 8,679
Interest cost |  | 1,127 | 6,145 | 7,735
Actuarial gain |  | (19,978) | (8,045) |
Curtailment gain |  | 0 | (17,324) |
Special termination benefits |  | 0 | 315 |
Settlement |  | (242,232) | 0 |
Exchange gain |  | (3,093) | (133) |
Benefit payments |  | (3,362) | (13,838) |
Benefit obligation, end of year |  | 36,609 | 293,926 | 318,887
Change in plan assets: |  |  |  |
Fair value, beginning of year | 208,344 | 208,344 | 168,134 |
Actual return |  | 368 | 37,789 |
Benefit payments |  | (3,362) | (13,838) |
Employer contributions |  | 36,882 | 16,259 |
Settlement |  | (242,232) | 0 |
Fair value, end of year |  | 0 | 208,344 | 168,134
Funded status |  | (36,609) | (85,582) |
Amounts recognized in the consolidated balance sheet: |  |  |  |
Current liability |  | (24,172) | (779) |
Noncurrent benefit liability |  | (12,437) | (84,803) |
Accumulated other comprehensive loss (income) |  | 325 | 49,236 |
Net amount recognized |  | (36,284) | (36,346) |
Amounts recognized in accumulated other comprehensive loss (income): |  |  |  |
Actuarial loss |  | 5,140 | 49,545 |
Prior service (credit) cost |  | (4,815) | (309) |
Other Postretirement |  |  |  |
Change in benefit obligation: |  |  |  |
Benefit obligation, beginning of year | 18,841 | 18,841 | 19,431 |
Acquisitions |  | 0 | 0 |
Service cost |  | 165 | 201 | 227
Interest cost |  | 411 | 376 | 501
Actuarial gain |  | (5,989) | (660) |
Curtailment gain |  | 0 | 0 |
Special termination benefits |  | 0 | 0 |
Settlement |  | 0 | 0 |
Exchange gain |  | 0 | 0 |
Benefit payments |  | (615) | (507) |
Benefit obligation, end of year |  | 12,813 | 18,841 | 19,431
Change in plan assets: |  |  |  |
Fair value, beginning of year | $ 0 | 0 | 0 |
Actual return |  | 0 | 0 |
Benefit payments |  | (615) | (507) |
Employer contributions |  | 615 | 507 |
Settlement |  | 0 | 0 |
Fair value, end of year |  | 0 | 0 | $ 0
Funded status |  | (12,813) | (18,841) |
Amounts recognized in the consolidated balance sheet: |  |  |  |
Current liability |  | (830) | (883) |
Noncurrent benefit liability |  | (11,983) | (17,958) |
Accumulated other comprehensive loss (income) |  | (7,293) | (1,668) |
Net amount recognized |  | (20,106) | (20,509) |
Amounts recognized in accumulated other comprehensive loss (income): |  |  |  |
Actuarial loss |  | (5,973) | 16 |
Prior service (credit) cost |  | $ (1,320) | $ (1,684) |

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