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Derivative Financial Instruments Derivative Financial Instruments - Oil and Gas Commodity Contracts (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2013 | Jun. 30, 2013
Derivative [Line Items] |  |
Document Period End Date |  | Jun. 30, 2013
Percentage of production volume covered by derivative financial instruments | 76.80% | 69.70%
Swap [Member] |  |
Derivative [Line Items] |  |
June 30, 2013 | $ 3.5 | $ 3.5
Swap [Member] | Natural Gas Commodity Contract [Member] |  |
Derivative [Line Items] |  |
Natural Gas, Volume | 21,158,000 | 21,158,000
June 30, 2013 | 3.2 | 3.2
Swap [Member] | Natural Gas Commodity Contract [Member] | Remainder of 2013 [Member] |  |
Derivative [Line Items] |  |
Natural Gas, Volume | 10,281,000 | 10,281,000
Weighted average strike price per Mmbtu/Bbl | 3.72 | 3.72
June 30, 2013 | 0.8 | 0.8
Swap [Member] | Natural Gas Commodity Contract [Member] | 2014 [Member] |  |
Derivative [Line Items] |  |
Natural Gas, Volume | 10,877,000 | 10,877,000
Weighted average strike price per Mmbtu/Bbl | 4.14 | 4.14
June 30, 2013 | 2.4 | 2.4
Swap [Member] | Oil Commodity Contract [Member] |  |
Derivative [Line Items] |  |
June 30, 2013 | 0.3 | 0.3
Derivative, Commodity Contract, Oil Volume | 478,000 | 478,000
Swap [Member] | Oil Commodity Contract [Member] | Remainder of 2013 [Member] |  |
Derivative [Line Items] |  |
Weighted average strike price per Mmbtu/Bbl | 94.05 | 94.05
June 30, 2013 | (0.2) | (0.2)
Derivative, Commodity Contract, Oil Volume | 206,000 | 206,000
Swap [Member] | Oil Commodity Contract [Member] | 2014 [Member] |  |
Derivative [Line Items] |  |
Weighted average strike price per Mmbtu/Bbl | 91.87 | 91.87
June 30, 2013 | $ 0.5 | $ 0.5
Derivative, Commodity Contract, Oil Volume | 272,000 | 272,000

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