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Business Information - Narrative (Details) $ in Thousands | 12 Months Ended
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Sep. 30, 2017 USD ($) bargaining_unit segment employee | Sep. 30, 2016 USD ($)
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Number of reportable segments | segment | 1 |
Identifiable assets | $ 58,753 | $ 72,382
Number of employees represented by separate collective bargaining agreements | employee | 234 |
Number of collective bargain agreements | bargaining_unit | 3 |
United States |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Identifiable assets | $ 33,114 | 44,108
Europe |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Identifiable assets | 25,639 | 28,274
Ireland and Italy |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Identifiable assets | $ 37,607 | $ 37,196
Sales Revenue, Net | United States |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Concentration risk based on geographic location, percent | 63.00% | 62.00%
Sales Revenue, Net | Europe |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Concentration risk based on geographic location, percent | 27.00% | 22.00%
Sales Revenue, Net | Asia |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Concentration risk based on geographic location, percent | 2.00% | 4.00%

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