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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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Amount, after tax, of accumulated increase (decrease) in equity from transaction and other event and circumstance from nonowner source.

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Amount before tax of increase (decrease) in accumulated equity from transactions and other events and circumstances from non-owner sources, attributable to parent. Excludes net income (loss), and accumulated changes in equity from transactions resulting from investments by owners (distributions to owners).

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