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SHAREHOLDERS' EQUITY - Components of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
--- | --- | --- | ---
After-tax amounts: |  |  |
Unrealized actuarial loss | $ (7,981) | $ (12,072) |
Unrealized actuarial loss |  |  |
Pre-tax amounts: |  |  |
Unrealized actuarial loss | (10,407) | (15,703) | $ (26,268)
After-tax amounts: |  |  |
Unrealized actuarial loss | (7,981) | (12,072) | (20,244)
Accumulated Other Comprehensive Income (Loss) |  |  |
Pre-tax amounts: |  |  |
Unrealized actuarial loss | (10,407) | (15,703) | (26,268)
After-tax amounts: |  |  |
Unrealized actuarial loss | $ (7,981) | $ (12,072) | $ (20,244)

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