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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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+ References

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 45
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13433-108611

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13495-108611

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