Major Customers

12 Months Ended

Sep. 30, 2011

Major Customers [Abstract]

Major Customers

12.    Major Customers

The Company operates in only one business segment, contract seismic data acquisition and processing services. The major customers in fiscal 2011, 2010 and 2009 have varied. Sales to these customers, as a percentage of operating revenues that exceeded 10%, were as follows:

	2011			2010			2009
A		27	%		32	%		31	%
B		24	%		—			—

Although 27% and 24% of the Company’s fiscal 2011 revenues were derived from two clients, the Company believes that the relationship is well founded for continued contractual commitments for the foreseeable future in multiple producing basins across the lower 48 states.