Summary of Revenue by Geographic Area (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Schedule Of Revenues From External Customers [Line Items]
Revenue	$ 16,008	$ 19,751	$ 27,942	$ 21,166	$ 26,285	$ 40,728	$ 68,551	$ 101,348	$ 84,867	$ 236,912	$ 300,607
Asia (excluding Middle East)
Schedule Of Revenues From External Customers [Line Items]
Revenue									8,755	5,028	8,789
Canada
Schedule Of Revenues From External Customers [Line Items]
Revenue									2,298	42,632	74,839
Europe
Schedule Of Revenues From External Customers [Line Items]
Revenue									13,672	71,713	115,226
Middle East
Schedule Of Revenues From External Customers [Line Items]
Revenue									2,024	7,550	2,385
United States
Schedule Of Revenues From External Customers [Line Items]
Revenue									50,101	96,380	88,512
Other
Schedule Of Revenues From External Customers [Line Items]
Revenue									$ 8,017	$ 13,609	$ 10,856