Retirement Benefit Plans - Narrative (Details) - USD ($) $ in Thousands	6 Months Ended
Mar. 31, 2022	Mar. 31, 2021
Retirement Benefits [Abstract]
Contributions amount in defined benefit pension plans	$ 0	$ 56
Additional cash contributions planned for fiscal 2022	$ 3

Amount of contribution received by defined benefit plan from employer which increases plan assets.

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Name:	us-gaap_DefinedBenefitPlanContributionsByEmployer
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration