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Retirement Benefit Plans - Components of Net Periodic Benefit Cost (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2025	Mar. 31, 2024
Retirement Benefits [Abstract]
Service cost	$ 43	$ 45	$ 87	$ 90
Interest cost	236	271	472	542
Expected return on plan assets	(264)	(260)	(529)	(521)
Amortization of net loss	22	43	45	86
Net periodic pension cost	$ 37	$ 99	$ 75	$ 197

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Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan.

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Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan.

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