Long-lived Assets (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013
Schedule Of Long Lived Assets [Line Items]
Long-lived assets	$ 110,903	$ 93,528
United States
Schedule Of Long Lived Assets [Line Items]
Long-lived assets	63,369	46,712
Canada
Schedule Of Long Lived Assets [Line Items]
Long-lived assets	32,270	32,078
Colombia
Schedule Of Long Lived Assets [Line Items]
Long-lived assets	12,122	7,554
Russian Federation
Schedule Of Long Lived Assets [Line Items]
Long-lived assets	2,549	6,820
United Kingdom
Schedule Of Long Lived Assets [Line Items]
Long-lived assets	579	350
China
Schedule Of Long Lived Assets [Line Items]
Long-lived assets	$ 14	$ 14