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Retirement Benefit Plans - Components of Net Periodic Benefit Cost (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Retirement Benefits [Abstract]
Service cost	$ 43	$ 45	$ 130	$ 135
Interest cost	236	271	708	813
Expected return on plan assets	(264)	(261)	(793)	(782)
Amortization of net loss	23	44	68	130
Settlement cost	0	60	0	60
Net periodic pension cost	$ 38	$ 159	$ 113	$ 356

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