Retirement Benefit Plans - Narrative (Details) - USD ($)	6 Months Ended
Mar. 31, 2019	Mar. 31, 2018
Retirement Benefits [Abstract]
Contributions amount in defined benefit pension plans	$ 48,000	$ 0
Additional cash contributions planned during fiscal 2019	$ 103,000

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