Geographic Information (Schedule of Long-Lived Assets by Geographical Areas) (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Sep. 30, 2015
Revenues From External Customers And Long Lived Assets [Line Items]
Property, plant and equipment, net	$ 144,977	$ 154,594
United States
Revenues From External Customers And Long Lived Assets [Line Items]
Property, plant and equipment, net	88,304	95,694
Canada
Revenues From External Customers And Long Lived Assets [Line Items]
Property, plant and equipment, net	52,292	53,879
United Kingdom
Revenues From External Customers And Long Lived Assets [Line Items]
Property, plant and equipment, net	$ 4,381	$ 5,021