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SHAREHOLDERS' EQUITY - Schedule of Changes in Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2024 | Dec. 31, 2023 | Mar. 31, 2023 | Dec. 31, 2022 | Mar. 31, 2024 | Mar. 31, 2023
Rollforward of accumulated other comprehensive income (loss), net of tax |  |  |  |  |  |
Beginning balance | $ 2,759,646 | $ 2,771,943 | $ 2,745,145 | $ 2,765,472 | $ 2,771,943 | $ 2,765,472
Net current-period other comprehensive income | 134 | 134 | 256 | 256 | 268 | 512
Ending balance | 2,803,074 | 2,759,646 | $ 2,755,806 | $ 2,745,145 | 2,803,074 | $ 2,755,806
Unrealized pension actuarial loss |  |  |  |  |  |
Rollforward of accumulated other comprehensive income (loss), net of tax |  |  |  |  |  |
Beginning balance | (7,847) | (7,981) |  |  | (7,981) |
Net current-period other comprehensive income | 134 |  |  |  | 268 |
Ending balance | $ (7,713) | $ (7,847) |  |  | $ (7,713) |

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