Summary of Company's Segment Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Segment Reporting Information [Line Items]
Net Revenues	$ 21,166	$ 101,348
Income (loss) from operations	(9,888)	35,667
Seismic | Operating Segments
Segment Reporting Information [Line Items]
Net Revenues	15,593	95,227
Income (loss) from operations	(7,385)	38,543
Non-Seismic | Operating Segments
Segment Reporting Information [Line Items]
Net Revenues	5,431	5,912
Income (loss) from operations	858	774
Corporate | Corporate, Non-Segment
Segment Reporting Information [Line Items]
Net Revenues	142	209
Income (loss) from operations	$ (3,361)	$ (3,650)