Information On Oil And Natural Gas Producing Activities	12 Months Ended
Sep. 30, 2011
Information On Oil And Natural Gas Producing Activities/Supplementary Information On Oil And Natural Gas Reserves (Unaudited) [Abstract]
INFORMATION ON OIL AND NATURAL GAS PRODUCING ACTIVITIES	10. INFORMATION ON OIL AND NATURAL GAS PRODUCING ACTIVITIES All oil and natural gas producing activities of the Company are conducted within the United States (principally in Oklahoma and Arkansas) and represent substantially all of the business activities of the Company. During 2011, 2010 and 2009, approximately 15%, 14% and 20%, respectively, of the Company’s total revenues were derived from sales through Chesapeake Operating, Inc. During 2011, 2010 and 2009, approximately 7%, 11% and 14%, respectively, of the Company’s total revenues were derived from sales through JMA Energy Company. During 2011, 2010 and 2009, approximately 14%, 15% and 17% of the Company’s total revenues were derived from sales through Newfield Exploration.

Information On Oil And Natural Gas Producing Activities

12 Months Ended

Sep. 30, 2011

Information On Oil And Natural Gas Producing Activities/Supplementary Information On Oil And Natural Gas Reserves (Unaudited) [Abstract]

INFORMATION ON OIL AND NATURAL GAS PRODUCING ACTIVITIES

10. INFORMATION ON OIL AND NATURAL GAS PRODUCING ACTIVITIES

All oil and natural gas producing activities of the Company are conducted within the United States (principally in Oklahoma and Arkansas) and represent substantially all of the business activities of the Company.

During 2011, 2010 and 2009, approximately 15%, 14% and 20%, respectively, of the Company’s total revenues were derived from sales through Chesapeake Operating, Inc. During 2011, 2010 and 2009, approximately 7%, 11% and 14%, respectively, of the Company’s total revenues were derived from sales through JMA Energy Company. During 2011, 2010 and 2009, approximately 14%, 15% and 17% of the Company’s total revenues were derived from sales through Newfield Exploration.