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Defined Benefit Pension Plan - Net Period Benefit Cost (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Retirement Benefits [Abstract]
Interest cost	$ 438	$ 431	$ 618
Expected return on plan assets	(793)	(797)	(965)
Amortization of prior service cost	21	19	0
Total net periodic benefit	$ (334)	$ (347)	$ (347)

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Amount of prior service cost (credit) recognized in net periodic benefit cost (credit) of defined benefit plan.

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