Information On Oil And Natural Gas Producing Activities (Tables)

12 Months Ended

Sep. 30, 2016

Oil And Gas Exploration And Production Industries Disclosures [Abstract]

Summary Of Sales Through Various Operators Or Purchasers

	2016			2015			2014
Cheyenne Petroleum		23	%		23	%		6	%
Southwestern Energy Company		12	%		14	%		17	%
Chesapeake Operating, Inc.		4	%		7	%		11	%