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SHAREHOLDERS' EQUITY - Schedule of Components of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Sep. 30, 2024
After-tax amounts:
Unrealized pension actuarial loss	$ (5,987)	$ (6,350)
Accumulated Other Comprehensive Income (Loss)
Pre-tax amounts:
Unrealized pension actuarial loss	(7,825)	(8,294)
After-tax amounts:
Unrealized pension actuarial loss	(5,987)	(6,350)
Unrealized pension actuarial loss
Pre-tax amounts:
Unrealized pension actuarial loss	(7,563)	(7,632)
After-tax amounts:
Unrealized pension actuarial loss	(5,784)	(5,838)
Unrealized loss on available-for-sale debt security
Pre-tax amounts:
Unrealized pension actuarial loss	(262)	(662)
After-tax amounts:
Unrealized pension actuarial loss	$ (203)	$ (512)

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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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