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Acquisitions (Details)
a in Thousands, Mcfe in Thousands, $ in Millions
 9 Months Ended
Jun. 30, 2017
a
Feb. 27, 2017
a
Mcfe
well
mi
Feb. 01, 2017
a
Sep. 30, 2017
USD ($)
Bankruptcy Auction        
Business Acquisition [Line Items]        
Area of property acquired (in acres) | a   85    
Number of acres with drilling rights (in acres) | a   44    
Production of well (in Mcfe) | Mcfe   110    
Number of wells acquired | well   174    
Number of producing wells acquired | well   120    
Number of miles of pipeline acquired | mi   20    
Allegheny, Washington, and Westmore Counties        
Business Acquisition [Line Items]        
Area of property acquired (in acres) | a 11      
2017 Acquisitions        
Business Acquisition [Line Items]        
Payments to acquire businesses | $       $ 740.1
Property, plant, and equipment assumed | $       750.1
Current liabilities assumed | $       5.3
Noncurrent liabilities, assumed | $       $ 4.7
Marion, Monongalia, and Wetzel Counties        
Business Acquisition [Line Items]        
Area of property acquired (in acres) | a     14