Long-lived Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Sep. 30, 2014
Schedule Of Long Lived Assets [Line Items]
Long-lived assets	$ 100,451	$ 110,903
United States
Schedule Of Long Lived Assets [Line Items]
Long-lived assets	70,170	63,369
Canada
Schedule Of Long Lived Assets [Line Items]
Long-lived assets	19,323	32,270
Colombia
Schedule Of Long Lived Assets [Line Items]
Long-lived assets	9,227	12,122
Russian Federation
Schedule Of Long Lived Assets [Line Items]
Long-lived assets	1,215	2,549
United Kingdom
Schedule Of Long Lived Assets [Line Items]
Long-lived assets	502	579
China
Schedule Of Long Lived Assets [Line Items]
Long-lived assets	$ 14	$ 14