Summary of Company's Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Segment Reporting Information [Line Items]
Net Revenues	$ 19,751	$ 40,728	$ 68,859	$ 210,627
Income (loss) from operations	(12,451)	5,458	(30,888)	57,081
Corporate, Non-Segment
Segment Reporting Information [Line Items]
Net Revenues	115	142	399	404
Income (loss) from operations	(3,169)	(3,468)	(9,837)	(10,898)
Seismic | Operating Segments
Segment Reporting Information [Line Items]
Net Revenues	13,538	35,377	51,912	194,307
Income (loss) from operations	(10,253)	8,149	(23,382)	66,165
Non-Seismic | Operating Segments
Segment Reporting Information [Line Items]
Net Revenues	6,098	5,209	16,548	15,916
Income (loss) from operations	$ 971	$ 777	$ 2,331	$ 1,814