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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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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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