Business Information - Narrative (Details) $ in Thousands	12 Months Ended
	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%