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SHAREHOLDERS' EQUITY - Components of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Sep. 30, 2023
--- | --- | ---
After-tax amounts: |  |
Unrealized pension actuarial loss | $ (7,713) | $ (7,981)
Unrealized pension actuarial loss |  |
Pre-tax amounts: |  |
Unrealized pension actuarial loss | (10,059) | (10,407)
After-tax amounts: |  |
Unrealized pension actuarial loss | (7,713) | (7,981)
Accumulated Other Comprehensive Income (Loss) |  |
Pre-tax amounts: |  |
Unrealized pension actuarial loss | (10,059) | (10,407)
After-tax amounts: |  |
Unrealized pension actuarial loss | $ (7,713) | $ (7,981)

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