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SHAREHOLDERS' EQUITY - Components of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | Jun. 30, 2023 | Sep. 30, 2022
--- | --- | ---
After-tax amounts: |  |
Unrealized actuarial loss | $ (11,305) | $ (12,072)
Unrealized actuarial loss |  |
Pre-tax amounts: |  |
Unrealized actuarial loss | (14,710) | (15,703)
After-tax amounts: |  |
Unrealized actuarial loss | (11,305) | (12,072)
Accumulated Other Comprehensive Income (Loss) |  |
Pre-tax amounts: |  |
Unrealized actuarial loss | (14,710) | (15,703)
After-tax amounts: |  |
Unrealized actuarial loss | $ (11,305) | $ (12,072)

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