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Business Information - Narrative (Details) $ in Thousands | 12 Months Ended
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Sep. 30, 2023 USD ($) segment bargaining_unit hourly_plant_personnel | Sep. 30, 2022 USD ($)
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Number of operating segments | segment | 1 |
Identifiable assets | $ 54,519 | $ 58,487
Number of employees represented by separate collective bargaining agreements | hourly_plant_personnel | 189 |
Number of collective bargain agreements | bargaining_unit | 3 |
Number of units entered into early negotiations and ratification of CBA | bargaining_unit | 2 |
United States |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Identifiable assets | $ 47,261 | 51,801
Europe |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Identifiable assets | 7,258 | 6,686
Maniago |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Identifiable assets | $ 16,460 | $ 15,219
Sales Revenue, Net | Geographic Concentration Risk | United States |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Percentage of concentration risk | 59.00% | 72.00%
Sales Revenue, Net | Geographic Concentration Risk | Europe |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Percentage of concentration risk | 29.00% | 19.00%
Sales Revenue, Net | Geographic Concentration Risk | Asia |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Percentage of concentration risk | 7.00% | 6.00%
Sales Revenue, Net | Geographic Concentration Risk | Other North American countries |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Percentage of concentration risk | 6.00% | 3.00%
Assets, Total | Geographic Concentration Risk | Maniago |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Percentage of concentration risk | 17.00% | 16.00%

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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 42 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-42 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482907/825-10-50-21 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482907/825-10-50-20 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482861/275-10-50-18 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482861/275-10-50-20 + Details
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