Summary of Revenues by Geographic Area (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Schedule Of Revenues From External Customers [Line Items]
Revenues	$ 26,285	$ 40,728	$ 68,551	$ 101,348	$ 68,288	$ 78,148	$ 76,420	$ 77,751	$ 236,912	$ 300,607	$ 191,664
Other									13,609	10,856	7,346
Asia
Schedule Of Revenues From External Customers [Line Items]
Revenues									5,028	8,789	10,753
Canada
Schedule Of Revenues From External Customers [Line Items]
Revenues									42,632	74,839	59,602
Europe
Schedule Of Revenues From External Customers [Line Items]
Revenues									71,713	115,226	3,043
Middle East
Schedule Of Revenues From External Customers [Line Items]
Revenues									7,550	2,385	8,542
United States
Schedule Of Revenues From External Customers [Line Items]
Revenues									$ 96,380	$ 88,512	$ 102,378