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Derivative Financial Instruments Derivative Financial Instruments - Oil and Gas Commodity Contracts (Details) bbl in Thousands, MMBTU in Thousands, MBbls in Thousands, $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jun. 30, 2016 USD ($) MMBTU $ / MMBTU $ / bbl MBbls | Jun. 30, 2015 | Jun. 30, 2016 USD ($) MMBTU $ / MMBTU $ / bbl MBbls | Jun. 30, 2015 | Sep. 30, 2015 MMBTU bbl
Derivative [Line Items] |  |  |  |  |
Derivative, Percentage of Production Volume Covered by Derivative Financial Instruments | 36.00% | 64.00% | 42.00% | 58.00% |
Natural Gas Commodity Contract [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Natural Gas, Volume | MMBTU | 6,235 |  | 6,235 |  |
Fair Value at June 30, 2016 | $ (1.6) |  | $ (1.6) |  |
Oil Commodity Contract [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Fair Value at June 30, 2016 | $ 0.3 |  | $ 0.3 |  |
Derivative, Commodity Contract, Oil Volume | MBbls | 0 |  | 0 |  |
Swap [Member] | Natural Gas Commodity Contract [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Natural Gas, Volume | MMBTU |  |  |  |  | 3,380
Swap [Member] | Natural Gas Commodity Contract [Member] | Remainder of 2014 [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Natural Gas, Volume | MMBTU | 450 |  | 450 |  |
Weighted average strike price per Mmbtu/Bbl | $ / MMBTU | 3.35 |  | 3.35 |  |
Fair Value at June 30, 2016 | $ 0.0 |  | $ 0.0 |  |
Swap [Member] | Oil Commodity Contract [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative, Commodity Contract, Oil Volume | bbl |  |  |  |  | 273
Collar [Member] | Natural Gas Commodity Contract [Member] | November 2016 - March 2017 [Domain] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Natural Gas, Volume | MMBTU | 2,265 |  | 2,265 |  |
Fair Value at June 30, 2016 | $ (0.6) |  | $ (0.6) |  |
Collar [Member] | Natural Gas Commodity Contract [Member] | January - March 2017 [Domain] [Domain] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Natural Gas, Volume | MMBTU | 450 |  | 450 |  |
Fair Value at June 30, 2016 | $ 0.0 |  | $ 0.0 |  |
Collar [Member] | Natural Gas Commodity Contract [Member] | June - October 2016 [Domain] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Natural Gas, Volume | MMBTU | 1,230 |  | 1,230 |  |
Fair Value at June 30, 2016 | $ (0.5) |  | $ (0.5) |  |
Collar [Member] | Natural Gas Commodity Contract [Member] | June - December 2016 [Domain] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Natural Gas, Volume | MMBTU | 1,840 |  | 1,840 |  |
Fair Value at June 30, 2016 | $ (0.5) |  | $ (0.5) |  |
Collar [Member] | Natural Gas Commodity Option Contract- Short call [Member] [Member] | November 2016 - March 2017 [Domain] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Weighted average strike price per Mmbtu/Bbl | $ / MMBTU | 3.36 |  | 3.36 |  |
Collar [Member] | Natural Gas Commodity Option Contract- Short call [Member] [Member] | January - March 2017 [Domain] [Domain] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Weighted average strike price per Mmbtu/Bbl | $ / MMBTU | 3.80 |  | 3.80 |  |
Collar [Member] | Natural Gas Commodity Option Contract- Short call [Member] [Member] | June - October 2016 [Domain] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Weighted average strike price per Mmbtu/Bbl | $ / MMBTU | 2.48 |  | 2.48 |  |
Collar [Member] | Natural Gas Commodity Option Contract- Short call [Member] [Member] | June - December 2016 [Domain] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Weighted average strike price per Mmbtu/Bbl | $ / MMBTU | 2.77 |  | 2.77 |  |
Collar [Member] | Natural Gas Commodity Commodity Contract- Long put [Member] | November 2016 - March 2017 [Domain] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Weighted average strike price per Mmbtu/Bbl | $ / MMBTU | 2.70 |  | 2.70 |  |
Collar [Member] | Natural Gas Commodity Commodity Contract- Long put [Member] | January - March 2017 [Domain] [Domain] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Weighted average strike price per Mmbtu/Bbl | $ / MMBTU | 3.05 |  | 3.05 |  |
Collar [Member] | Natural Gas Commodity Commodity Contract- Long put [Member] | June - October 2016 [Domain] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Weighted average strike price per Mmbtu/Bbl | $ / MMBTU | 2.15 |  | 2.15 |  |
Collar [Member] | Natural Gas Commodity Commodity Contract- Long put [Member] | June - December 2016 [Domain] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Weighted average strike price per Mmbtu/Bbl | $ / MMBTU | 2.15 |  | 2.15 |  |
Three-way collar [Member] | Natural Gas Commodity Contract [Member] | July - December 2016 [Domain] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Fair Value at June 30, 2016 | $ 0.0 |  | $ 0.0 |  |
Three-way collar [Member] | Oil Commodity Contract [Member] | July - December 2016 [Domain] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative, Commodity Contract, Oil Volume | MBbls | 0 |  | 0 |  |
Three-way collar [Member] | Oil Commodity Contract [Member] | June - December 2016 [Domain] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Fair Value at June 30, 2016 | $ 0.3 |  | $ 0.3 |  |
Derivative, Commodity Contract, Oil Volume | MBbls | 92 |  | 92 |  |
Oil and Gas Properties [Member] | Energy Related Derivative [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Fair Value at June 30, 2016 | $ (1.3) |  | $ (1.3) |  |
Short put [Member] | Three-way collar [Member] | Oil Commodity Contract [Member] | June - December 2016 [Domain] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Weighted average strike price per Mmbtu/Bbl | $ / bbl | 42.00 |  | 42.00 |  |
Long put [Member] | Three-way collar [Member] | Oil Commodity Contract [Member] | July - December 2016 [Domain] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Weighted average strike price per Mmbtu/Bbl | $ / bbl | 40.00 |  | 40.00 |  |
Long put [Member] | Three-way collar [Member] | Oil Commodity Contract [Member] | June - December 2016 [Domain] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Weighted average strike price per Mmbtu/Bbl | $ / bbl | 56.00 |  | 56.00 |  |
Short call [Member] | Three-way collar [Member] | Oil Commodity Contract [Member] | July - December 2016 [Domain] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Weighted average strike price per Mmbtu/Bbl | $ / bbl | 54.00 |  | 54.00 |  |
Short call [Member] | Three-way collar [Member] | Oil Commodity Contract [Member] | June - December 2016 [Domain] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Weighted average strike price per Mmbtu/Bbl | $ / bbl | 76.00 |  | 76.00 |  |

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