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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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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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