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SHAREHOLDERS' EQUITY - Components of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
After-tax amounts:
Unrealized pension actuarial loss	$ (6,350)	$ (7,981)
Accumulated Other Comprehensive Income (Loss)
Pre-tax amounts:
Unrealized pension actuarial loss	(8,294)	(10,407)	$ (15,703)
After-tax amounts:
Unrealized pension actuarial loss	(6,350)	(7,981)	(12,072)
Unrealized pension actuarial loss
Pre-tax amounts:
Unrealized pension actuarial loss	(7,632)	(10,407)	(15,703)
After-tax amounts:
Unrealized pension actuarial loss	(5,838)	(7,981)	(12,072)
Unrealized Loss on Available-for-Sale Securities
Pre-tax amounts:
Unrealized pension actuarial loss	(662)	0	0
After-tax amounts:
Unrealized pension actuarial loss	$ (512)	$ 0	$ 0

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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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