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Business Information - Narrative (Details) $ in Thousands | 4 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 separate_bargaining_unit | Sep. 30, 2020 USD ($) employee Segment separate_bargaining_unit | Sep. 30, 2019 USD ($)
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Number of reportable segments | Segment |  | 1 |
Identifiable assets |  | $ 66,741 | $ 46,641
Number of employees represented by separate collective bargaining agreements | employee |  | 203 |
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 |  | $ 56,134 | 35,079
Europe |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Identifiable assets |  | 10,607 | 11,562
Maniago |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Identifiable assets |  | $ 21,989 | $ 20,986
Sales Revenue, Net | United States |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Percentage of concentration risk |  | 72.00% | 72.00%
Sales Revenue, Net | Europe |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Percentage of concentration risk |  | 14.00% | 15.00%
Sales Revenue, Net | Asia |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Percentage of concentration risk |  | 8.00% | 6.00%

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