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EMPLOYEE BENEFIT PLANS - COMPONENTS OF NET PERIODIC COST (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2024 | Jan. 02, 2024 | Mar. 31, 2023 | Mar. 31, 2024 | Mar. 31, 2023 | Sep. 30, 2023
Pension |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |
Service cost | $ 1,244 |  | $ 1,351 | $ 2,488 | $ 2,701 |
Interest cost | 4,060 |  | 3,793 | 8,120 | 7,587 |
Expected return on plan assets | (5,086) |  | (4,993) | (10,173) | (9,986) |
Recognized actuarial loss | 30 |  | 75 | 59 | 150 |
Prior service cost (credit) amortization | 15 |  | 26 | 31 | 51 |
Net periodic benefit cost | 263 |  | 252 | 525 | 503 |
OPEB |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |
Service cost | 255 | $ 642 | 618 | 897 | 1,236 | $ 2,471
Interest cost | 1,808 | $ 2,902 | 2,287 | 4,710 | 4,573 | $ 9,146
Expected return on plan assets | (2,020) |  | (1,681) | (3,878) | (3,361) |
Recognized actuarial loss | 1,255 |  | 0 | 1,751 | 0 |
Prior service cost (credit) amortization | (3,337) |  | 0 | (3,337) | 0 |
Net periodic benefit cost | $ (2,039) |  | $ 1,224 | $ 143 | $ 2,448 |

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