Supplementary Information On Oil, Ngl And Natural Gas Reserves (Summary of Proved Undeveloped Reserves) (Details)	12 Months Ended
	Sep. 30, 2015 Mcfe
Supplementary Information On Oil, Ngl And Natural Gas Reserves [Abstract]
Beginning proved undeveloped reserves	90,904,931
Proved undeveloped reserves transferred to proved developed	(13,642,311)
Revisions	(32,417,179)
Extensions and discoveries	27,072,158
Purchases
Ending proved undeveloped reserves	71,917,599