Long-lived Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Sep. 30, 2015
Schedule Of Long Lived Assets [Line Items]
Long-lived assets	$ 80,222	$ 100,451
United States
Schedule Of Long Lived Assets [Line Items]
Long-lived assets	62,921	70,170
Canada
Schedule Of Long Lived Assets [Line Items]
Long-lived assets	11,911	19,323
Colombia
Schedule Of Long Lived Assets [Line Items]
Long-lived assets	3,487	9,227
Russian Federation
Schedule Of Long Lived Assets [Line Items]
Long-lived assets	1,498	1,215
United Kingdom
Schedule Of Long Lived Assets [Line Items]
Long-lived assets	391	502
China
Schedule Of Long Lived Assets [Line Items]
Long-lived assets	$ 14	$ 14