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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, 2015
USD ($)
MMBTU
$ / MMBTU
$ / bbl
MBbls
Jun. 30, 2014
Jun. 30, 2015
USD ($)
MMBTU
$ / MMBTU
$ / bbl
MBbls
Jun. 30, 2014
Sep. 30, 2014
MMBTU
bbl
Derivative [Line Items]          
Derivative, Percentage of Production Volume Covered by Derivative Financial Instruments 64.00% 68.00% 58.00% 0.00%  
Swap [Member] | Natural Gas Commodity Contract [Member]          
Derivative [Line Items]          
Natural Gas, Volume | MMBTU 7,980   7,980   6,821
Fair Value at June 30, 2015 $ 6.0   $ 6.0    
Swap [Member] | Natural Gas Commodity Contract [Member] | Remainder of 2014 [Member]          
Derivative [Line Items]          
Natural Gas, Volume | MMBTU 5,520   5,520    
Weighted average strike price per Mmbtu/Bbl | $ / MMBTU 3.95   3.95    
Fair Value at June 30, 2015 $ 5.8   $ 5.8    
Swap [Member] | Oil Commodity Contract [Member]          
Derivative [Line Items]          
Fair Value at June 30, 2015 $ 4.3   $ 4.3    
Derivative, Commodity Contract, Oil Volume 290   290   254
Swap [Member] | Oil Commodity Contract [Member] | Remainder of 2014 [Member]          
Derivative [Line Items]          
Weighted average strike price per Mmbtu/Bbl | $ / bbl 94.98   94.98    
Fair Value at June 30, 2015 $ 4.3   $ 4.3    
Derivative, Commodity Contract, Oil Volume | MBbls 125   125    
Swap [Member] | Energy Related Derivative [Member]          
Derivative [Line Items]          
Fair Value at June 30, 2015 $ 10.3   $ 10.3    
Collar [Member] | Natural Gas Commodity Contract [Member] | Remainder of 2014 [Member]          
Derivative [Line Items]          
Fair Value at June 30, 2015 $ 0.0   $ 0.0    
Collar [Member] | Oil Commodity Contract [Member] | Remainder of 2014 [Member]          
Derivative [Line Items]          
Derivative, Commodity Contract, Oil Volume | MBbls 55   55    
Three-way collar [Member] | Natural Gas Commodity Contract [Member] | Remainder of 2014 [Member]          
Derivative [Line Items]          
Fair Value at June 30, 2015 $ 0.0   $ 0.0    
Three-way collar [Member] | Oil Commodity Contract [Member] | Remainder of 2014 [Member]          
Derivative [Line Items]          
Derivative, Commodity Contract, Oil Volume | MBbls 110   110    
Commodity Option [Member] | Natural Gas Commodity Contract [Member] | Remainder of 2014 [Member]          
Derivative [Line Items]          
Natural Gas, Volume | MMBTU 2,460   2,460    
Fair Value at June 30, 2015 $ 0.2   $ 0.2    
Commodity Option [Member] | Natural Gas Commodity Contract- Short put [Member] | Remainder of 2014 [Member]          
Derivative [Line Items]          
Weighted average strike price per Mmbtu/Bbl | $ / MMBTU 2.10   2.10    
Commodity Option [Member] | Natural Gas Commodity Option Contract- Short call [Member] [Member] | Remainder of 2014 [Member]          
Derivative [Line Items]          
Weighted average strike price per Mmbtu/Bbl | $ / MMBTU 3.27   3.27    
Commodity Option [Member] | Natural Gas Commodity Commodity Contract- Long put [Member] | Remainder of 2014 [Member]          
Derivative [Line Items]          
Weighted average strike price per Mmbtu/Bbl | $ / MMBTU 2.85   2.85    
Short put [Member] | Three-way collar [Member] | Oil Commodity Contract [Member] | Remainder of 2014 [Member]          
Derivative [Line Items]          
Weighted average strike price per Mmbtu/Bbl | $ / bbl 45.00   45.00    
Long put [Member] | Collar [Member] | Oil Commodity Contract [Member] | Remainder of 2014 [Member]          
Derivative [Line Items]          
Weighted average strike price per Mmbtu/Bbl | $ / bbl 50.00   50.00    
Long put [Member] | Three-way collar [Member] | Oil Commodity Contract [Member] | Remainder of 2014 [Member]          
Derivative [Line Items]          
Weighted average strike price per Mmbtu/Bbl | $ / bbl 60.00   60.00    
Short call [Member] | Collar [Member] | Oil Commodity Contract [Member] | Remainder of 2014 [Member]          
Derivative [Line Items]          
Weighted average strike price per Mmbtu/Bbl | $ / bbl 67.50   67.50    
Short call [Member] | Three-way collar [Member] | Oil Commodity Contract [Member] | Remainder of 2014 [Member]          
Derivative [Line Items]          
Weighted average strike price per Mmbtu/Bbl | $ / bbl 80.00   80.00