Derivatives (Summary Of Derivative Instruments Contracts) (Details)	Jun. 30, 2014 MMBTU	Sep. 30, 2013 MMBTU
Natural Gas Costless Collars [Member] | Fixed Price One [Member]
Derivative [Line Items]
Production volume covered per month - Natural Gas	140,000	80,000
Natural Gas Costless Collars [Member] | Fixed Price Two [Member]
Derivative [Line Items]
Production volume covered per month - Natural Gas		50,000
Natural Gas Costless Collars [Member] | Fixed Price Three [Member]
Derivative [Line Items]
Production volume covered per month - Natural Gas		100,000
Natural Gas Costless Collars [Member] | Fixed Price Four [Member]
Derivative [Line Items]
Production volume covered per month - Natural Gas		160,000
Natural Gas Fixed Price Swaps [Member] | Fixed Price Two [Member]
Derivative [Line Items]
Production volume covered per month - Natural Gas	140,000
Contract price	4.11
Natural Gas Fixed Price Swaps [Member] | Fixed Price Three [Member]
Derivative [Line Items]
Production volume covered per month - Natural Gas	50,000
Contract price	4.20
Natural Gas Fixed Price Swaps [Member] | Fixed Price Four [Member]
Derivative [Line Items]
Production volume covered per month - Natural Gas	50,000
Contract price	4.18
Natural Gas Fixed Price Swaps [Member] | Fixed Price Five [Member]
Derivative [Line Items]
Production volume covered per month - Natural Gas	50,000	100,000
Contract price	4.21	3.505
Natural Gas Fixed Price Swaps [Member] | Fixed Price Six [Member]
Derivative [Line Items]
Production volume covered per month - Natural Gas	30,000	70,000
Contract price	4.30	3.400
Natural Gas Fixed Price Swaps [Member] | Fixed Price Seven [Member]
Derivative [Line Items]
Production volume covered per month - Natural Gas	40,000	40,000
Contract price	4.61	3.655
Natural Gas Fixed Price Swaps [Member] | Fixed Price Eight [Member]
Derivative [Line Items]
Production volume covered per month - Natural Gas		100,000
Contract price		4.320
Oil Costless Collars [Member] | Fixed Price Eight [Member]
Derivative [Line Items]
Production volume covered per month - Oil	4,000
Oil Costless Collars [Member] | Fixed Price Nine [Member]
Derivative [Line Items]
Production volume covered per month - Oil	5,000	3,000
Oil Costless Collars [Member] | Fixed Price Ten [Member]
Derivative [Line Items]
Production volume covered per month - Oil		4,000
Oil Costless Collars [Member] | Fixed Price Eleven [Member]
Derivative [Line Items]
Production volume covered per month - Oil		2,000
Oil Costless Collars [Member] | Fixed Price Twelve [Member]
Derivative [Line Items]
Production volume covered per month - Oil		4,000
Oil Fixed Price Swaps [Member] | Fixed Price Ten [Member]
Derivative [Line Items]
Production volume covered per month - Oil	3,000
Contract price	94.50
Oil Fixed Price Swaps [Member] | Fixed Price Eleven [Member]
Derivative [Line Items]
Production volume covered per month - Oil	4,000
Contract price	95.25
Oil Fixed Price Swaps [Member] | Fixed Price Twelve [Member]
Derivative [Line Items]
Production volume covered per month - Oil	5,000
Contract price	94.20
Oil Fixed Price Swaps [Member] | Fixed Price Thirteen [Member]
Derivative [Line Items]
Production volume covered per month - Oil	6,000	4,000
Contract price	92.85	105.25
Oil Fixed Price Swaps [Member] | Fixed Price Fourteen [Member]
Derivative [Line Items]
Production volume covered per month - Oil	4,000
Contract price	99.40
Oil Fixed Price Swaps [Member] | Fixed Price Fifteen [Member]
Derivative [Line Items]
Production volume covered per month - Oil	7,000
Contract price	96.80
Oil Fixed Price Swaps [Member] | Fixed Price Sixteen [Member]
Derivative [Line Items]
Production volume covered per month - Oil	5,000
Contract price	97.40
Oil Fixed Price Swaps [Member] | Fixed Price Seventeen [Member]
Derivative [Line Items]
Production volume covered per month - Oil	5,000
Contract price	94.56
Oil Fixed Price Swaps [Member] | Fixed Price Eighteen [Member]
Derivative [Line Items]
Production volume covered per month - Oil	7,000
Contract price	93.91
Minimum [Member] | Natural Gas Costless Collars [Member] | Fixed Price One [Member]
Derivative [Line Items]
Contract price	3.75	3.75
Minimum [Member] | Natural Gas Costless Collars [Member] | Fixed Price Two [Member]
Derivative [Line Items]
Contract price		3.75
Minimum [Member] | Natural Gas Costless Collars [Member] | Fixed Price Three [Member]
Derivative [Line Items]
Contract price		3.75
Minimum [Member] | Natural Gas Costless Collars [Member] | Fixed Price Four [Member]
Derivative [Line Items]
Contract price		4.00
Minimum [Member] | Oil Costless Collars [Member] | Fixed Price Eight [Member]
Derivative [Line Items]
Contract price	85.00
Minimum [Member] | Oil Costless Collars [Member] | Fixed Price Nine [Member]
Derivative [Line Items]
Contract price	90.00	90.00
Minimum [Member] | Oil Costless Collars [Member] | Fixed Price Ten [Member]
Derivative [Line Items]
Contract price		90.00
Minimum [Member] | Oil Costless Collars [Member] | Fixed Price Eleven [Member]
Derivative [Line Items]
Contract price		90.00
Minimum [Member] | Oil Costless Collars [Member] | Fixed Price Twelve [Member]
Derivative [Line Items]
Contract price		90.00
Maximum [Member] | Natural Gas Costless Collars [Member] | Fixed Price One [Member]
Derivative [Line Items]
Contract price	4.50	4.25
Maximum [Member] | Natural Gas Costless Collars [Member] | Fixed Price Two [Member]
Derivative [Line Items]
Contract price		4.30
Maximum [Member] | Natural Gas Costless Collars [Member] | Fixed Price Three [Member]
Derivative [Line Items]
Contract price		4.05
Maximum [Member] | Natural Gas Costless Collars [Member] | Fixed Price Four [Member]
Derivative [Line Items]
Contract price		4.55
Maximum [Member] | Oil Costless Collars [Member] | Fixed Price Eight [Member]
Derivative [Line Items]
Contract price	100.00
Maximum [Member] | Oil Costless Collars [Member] | Fixed Price Nine [Member]
Derivative [Line Items]
Contract price	97.00	102.00
Maximum [Member] | Oil Costless Collars [Member] | Fixed Price Ten [Member]
Derivative [Line Items]
Contract price		101.50
Maximum [Member] | Oil Costless Collars [Member] | Fixed Price Eleven [Member]
Derivative [Line Items]
Contract price		97.50
Maximum [Member] | Oil Costless Collars [Member] | Fixed Price Twelve [Member]
Derivative [Line Items]
Contract price		101.50