Business Information - Additional Information (Details) $ in Thousands	12 Months Ended
	Sep. 30, 2016 USD ($) bargaining_unit segment employee	Sep. 30, 2015 USD ($)
Revenues from External Customers and Long-Lived Assets [Line Items]
Number of reportable segments | segment	1
Severance Costs		$ 964
Identifiable assets	$ 72,382	85,154
Number of Employees Represented by Separate Collective Bargaining Units | employee	287
Number of Collective Bargain Units | bargaining_unit	3
Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Identifiable assets	$ 28,274	31,141
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Identifiable assets	44,108	54,013
Ireland and Italy
Revenues from External Customers and Long-Lived Assets [Line Items]
Identifiable assets	$ 37,196	$ 45,235
Sales Revenue, Net | Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk based on geographic location, percent	22.00%	16.00%
Sales Revenue, Net | United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk based on geographic location, percent	62.00%	70.00%
Sales Revenue, Net | Asia
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk based on geographic location, percent	4.00%	4.00%