Derivatives (Summary Of Derivative Instruments Contracts) (Details)	Jun. 30, 2015 MMBTU $ / bbl $ / MMBTU bbl	Sep. 30, 2014 MMBTU $ / bbl $ / MMBTU bbl
Natural Gas Costless Collars [Member] | Fixed Price One [Member]
Derivative [Line Items]
Production volume covered per month - Natural Gas | MMBTU	100,000	140,000
Natural Gas Costless Collars [Member] | Fixed Price Two [Member]
Derivative [Line Items]
Production volume covered per month - Natural Gas | MMBTU	70,000
Natural Gas Costless Collars [Member] | Fixed Price Three [Member]
Derivative [Line Items]
Production volume covered per month - Natural Gas | MMBTU	70,000
Natural Gas Costless Collars [Member] | Fixed Price Four [Member]
Derivative [Line Items]
Production volume covered per month - Natural Gas | MMBTU	50,000
Natural Gas Costless Collars [Member] | Fixed Price Five [Member]
Derivative [Line Items]
Production volume covered per month - Natural Gas | MMBTU	70,000
Natural Gas Fixed Price Swaps [Member] | Fixed Price Two [Member]
Derivative [Line Items]
Production volume covered per month - Natural Gas | MMBTU		140,000
Contract price | $ / MMBTU		4.11
Natural Gas Fixed Price Swaps [Member] | Fixed Price Three [Member]
Derivative [Line Items]
Production volume covered per month - Natural Gas | MMBTU		30,000
Contract price | $ / MMBTU		4.30
Natural Gas Fixed Price Swaps [Member] | Fixed Price Four [Member]
Derivative [Line Items]
Production volume covered per month - Natural Gas | MMBTU		40,000
Contract price | $ / MMBTU		4.61
Oil Costless Collars [Member] | Fixed Price Five [Member]
Derivative [Line Items]
Production volume covered per month - Oil | bbl		4,000
Oil Costless Collars [Member] | Fixed Price Six [Member]
Derivative [Line Items]
Production volume covered per month - Oil | bbl	10,000	5,000
Oil Fixed Price Swaps [Member] | Fixed Price Seven [Member]
Derivative [Line Items]
Production volume covered per month - Oil | bbl	5,000	3,000
Contract price	94.56	94.50
Oil Fixed Price Swaps [Member] | Fixed Price Eight [Member]
Derivative [Line Items]
Production volume covered per month - Oil | bbl	7,000	4,000
Contract price	93.91	99.40
Oil Fixed Price Swaps [Member] | Fixed Price Nine [Member]
Derivative [Line Items]
Production volume covered per month - Oil | bbl		4,000
Contract price		95.25
Oil Fixed Price Swaps [Member] | Fixed Price Ten [Member]
Derivative [Line Items]
Production volume covered per month - Oil | bbl		5,000
Contract price		94.20
Oil Fixed Price Swaps [Member] | Fixed Price Eleven [Member]
Derivative [Line Items]
Production volume covered per month - Oil | bbl		6,000
Contract price		92.85
Oil Fixed Price Swaps [Member] | Fixed Price Twelve [Member]
Derivative [Line Items]
Production volume covered per month - Oil | bbl		7,000
Contract price		96.80
Oil Fixed Price Swaps [Member] | Fixed Price Thirteen [Member]
Derivative [Line Items]
Production volume covered per month - Oil | bbl		5,000
Contract price		97.40
Oil Fixed Price Swaps [Member] | Fixed Price Fourteen [Member]
Derivative [Line Items]
Production volume covered per month - Oil | bbl		4,000
Contract price		97.25
Oil Fixed Price Swaps [Member] | Fixed Price Fifteen [Member]
Derivative [Line Items]
Production volume covered per month - Oil | bbl		5,000
Contract price		94.56
Oil Fixed Price Swaps [Member] | Fixed Price Sixteen [Member]
Derivative [Line Items]
Production volume covered per month - Oil | bbl		7,000
Contract price		93.91
Minimum [Member] | Natural Gas Costless Collars [Member] | Fixed Price One [Member]
Derivative [Line Items]
Contract price | $ / MMBTU	3.50	3.75
Minimum [Member] | Natural Gas Costless Collars [Member] | Fixed Price Two [Member]
Derivative [Line Items]
Contract price | $ / MMBTU	3.25
Minimum [Member] | Natural Gas Costless Collars [Member] | Fixed Price Three [Member]
Derivative [Line Items]
Contract price | $ / MMBTU	3.50
Minimum [Member] | Natural Gas Costless Collars [Member] | Fixed Price Four [Member]
Derivative [Line Items]
Contract price | $ / MMBTU	3.50
Minimum [Member] | Natural Gas Costless Collars [Member] | Fixed Price Five [Member]
Derivative [Line Items]
Contract price | $ / MMBTU	3.50
Minimum [Member] | Oil Costless Collars [Member] | Fixed Price Five [Member]
Derivative [Line Items]
Contract price		85.00
Minimum [Member] | Oil Costless Collars [Member] | Fixed Price Six [Member]
Derivative [Line Items]
Contract price	80.00	90.00
Maximum [Member] | Natural Gas Costless Collars [Member] | Fixed Price One [Member]
Derivative [Line Items]
Contract price | $ / MMBTU	4.10	4.50
Maximum [Member] | Natural Gas Costless Collars [Member] | Fixed Price Two [Member]
Derivative [Line Items]
Contract price | $ / MMBTU	4.00
Maximum [Member] | Natural Gas Costless Collars [Member] | Fixed Price Three [Member]
Derivative [Line Items]
Contract price | $ / MMBTU	4.05
Maximum [Member] | Natural Gas Costless Collars [Member] | Fixed Price Four [Member]
Derivative [Line Items]
Contract price | $ / MMBTU	4.00
Maximum [Member] | Natural Gas Costless Collars [Member] | Fixed Price Five [Member]
Derivative [Line Items]
Contract price | $ / MMBTU	3.95
Maximum [Member] | Oil Costless Collars [Member] | Fixed Price Five [Member]
Derivative [Line Items]
Contract price		100.00
Maximum [Member] | Oil Costless Collars [Member] | Fixed Price Six [Member]
Derivative [Line Items]
Contract price	86.50	97.00