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Business Information - Narrative (Details) $ in Thousands | 12 Months Ended
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Sep. 30, 2021 USD ($) separate_bargaining_unit Segment hourly_plant_personnel | Sep. 30, 2020 USD ($)
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Number of reportable segments | Segment | 1 |
Identifiable assets | $ 63,095 | $ 66,741
Number of employees represented by separate collective bargaining agreements | hourly_plant_personnel | 177 |
Number of collective bargain agreements | separate_bargaining_unit | 3 |
Number of units entered into early negotiations and ratification of CBA | separate_bargaining_unit | 2 |
United States |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Identifiable assets | $ 54,109 | 56,134
Europe |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Identifiable assets | 8,986 | 10,607
Maniago |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Identifiable assets | $ 19,586 | $ 21,989
Sales Revenue, Net | Geographic Concentration Risk | United States |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Percentage of concentration risk | 66.00% | 72.00%
Sales Revenue, Net | Geographic Concentration Risk | Europe |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Percentage of concentration risk | 18.00% | 14.00%
Sales Revenue, Net | Geographic Concentration Risk | Asia |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Percentage of concentration risk | 8.00% | 8.00%

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