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Retirement Benefit Plans - Narrative (Details)	1 Months Ended	12 Months Ended
	Dec. 31, 2019 USD ($)	Sep. 30, 2024 USD ($) plan	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Number of defined benefit pension plans | plan		3
Increase in benefit obligation		$ 542,000
Benefit obligation		20,888,000	$ 20,345,000	$ 22,492,000
Employer contributions		$ 275,000
Other debt withdrawal liability	$ 739,000
Employer matching contribution percentage of employees' gross pay		100.00%
Percentage of eligible compensation of deferral contribution, minimum		1.00%
Percentage of eligible compensation		80.00%
Percentage of eligible compensation of deferral contribution, maximum		6.00%
Matching contribution expense for defined contribution plan		$ 550,000	516,000
Number of company sponsored defined benefit pension plans | plan		2
Non-elective contribution expense		$ 228,000	$ 222,000
Maximum
Defined Benefit Plan Disclosure [Line Items]
Non-elective contribution (in dollars per hour of work)		1.50
Minimum
Defined Benefit Plan Disclosure [Line Items]
Non-elective contribution (in dollars per hour of work)		$ 1.25
IAM National Pension Fund
Defined Benefit Plan Disclosure [Line Items]
Payment period	20 years

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-1

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-Topic 715
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-URI https://asc.fasb.org/1943274/2147480482/715-20-55-18

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