Supplementary Information On Oil, Ngl And Natural Gas Reserves (Summary of Proved Undeveloped Reserves) (Details)	12 Months Ended
	Sep. 30, 2014 Mcfe
Supplementary Information On Oil, Ngl And Natural Gas Reserves [Abstract]
Beginning proved undeveloped reserves	58,734,656
Proved undeveloped reserves transferred to proved developed	(17,488,307)
Revisions	(2,251,443)
Extensions and discoveries	17,776,338
Purchases	34,133,687
Ending proved undeveloped reserves	90,904,931