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Divestitures and Acquisitions (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Jan. 01, 2017
Sep. 30, 2016
Disposal Group, Including Discontinued Operation, Additional Disclosures [Abstract]            
Disposal Group, Including Discontinued Operation, Cash Purchase Price         $ 38,300  
Disposal Group, Including Discontinued Operation, Working Capital Adjustment         109,000  
Disposal Group, Including Discontinued Operation, Consideration         147,300  
Disposal Group, Including Discontinued Operation, Consideration Placed in Escrow         $ 7,000  
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax, Per Diluted Share     $ 0.03      
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract]            
Income tax expense   $ 3,414 $ 6,841 $ 3,495    
Income from discontinued operations, net of tax, before gain on disposal $ 0 5,050 10,994 5,172    
Gain (Loss) on Disposal of Discontinued Operation, Net of Tax     2,716 0    
Discontinued Operation, Tax Effect of Gain (Loss) from Disposal of Discontinued Operation 0 0 10,215 0    
Net income from discontinued operations 0 5,050 $ 13,710 5,172    
Business Acquisition [Line Items]            
Business Acquisition, Description of Acquired Entity    
On December 20, 2016, we executed a purchase and sale agreement to acquire the general partnership and limited partnership interests in EnLink North Texas Pipeline, LP (EnLink Pipeline) from EnLink Energy GP, LLC and EnLink Midstream Operating, LP for a cash purchase price of $85 million, plus working capital of $1.1 million.
EnLink Pipeline's primary asset was a 140–mile natural gas pipeline located on the north side of the Dallas–Fort Worth Metroplex. The $85 million purchase price has been allocated, based on fair value using observable market inputs, to the net book value of the acquired pipeline.
     
Natural Gas Marketing Segment [Member] | Discontinued Operations, Held-for-sale or Disposed of by Sale [Member]            
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract]            
Operating revenues 0 200,213 $ 303,474 728,989    
Purchased gas cost 0 184,398 277,554 698,445    
Operating expenses 0 7,047 7,874 19,940    
Operating income 0 8,768 18,046 10,604    
Other nonoperating expense 0 (304) (211) (1,937)    
Income from discontinued operations before income taxes 0 8,464 17,835 8,667    
Income tax expense 0 3,414 6,841 3,495    
Income from discontinued operations, net of tax, before gain on disposal     10,994 5,172    
Gain (Loss) on Disposal of Discontinued Operation, Net of Tax     2,716 0    
Net income from discontinued operations 0 $ 5,050 13,710 5,172    
Assets [Abstract]            
Total assets of the disposal group 0   0     $ 216,715
Liabilities [Abstract]            
Total liabilities of the disposal group 0   0     150,118
Discontinued Operation, Alternative Cash Flow Information [Abstract]            
Depreciation and Amortization, Discontinued Operations     185 1,743    
Capital Expenditure, Discontinued Operations     0 179    
Noncash Change in Commodity Contract Cash Flow Hedges     18,744 $ (33,898)    
Natural Gas Marketing Segment [Member] | Discontinued Operations, Held-for-sale or Disposed of by Sale [Member] | Disposal Group Assets and Liabilities Held for Sale [Member]            
Assets [Abstract]            
Net property, plant and equipment 0   0     11,905
Accounts receivable 0   0     93,551
Gas stored underground 0   0     54,246
Other current assets 0   0     14,711
Goodwill 0   0     16,445
Deferred charges and other assets 0   0     435
Total assets of the disposal group [1] 0   0     191,293
Liabilities [Abstract]            
Accounts payable and accrued liabilities 0   0     72,268
Other current liabilities 0   0     9,640
Deferred credits and other 0   0     316
Total liabilities of the disposal group [1] 0   0     82,224
Natural Gas Marketing Segment [Member] | Discontinued Operations, Held-for-sale or Disposed of by Sale [Member] | Disposal Group Assets and Liabilities Not Held for Sale [Member]            
Assets [Abstract]            
Cash 0   0     25,417
Other assets 0   0     5
Liabilities [Abstract]            
Intercompany note payable 0   0     35,000
Tax liabilities 0   0     15,471
Intercompany payables 0   0     14,139
Other liabilities $ 0   0     $ 3,284
Enlink North Texas Pipeline, LP [Member]            
Business Acquisition [Line Items]            
Business Acquisition, Date of Acquisition Agreement Dec. 20, 2016          
Payments to Acquire Businesses, Gross $ 85,000   85,000      
Other Payments to Acquire Businesses     $ 1,100      
[1] Amounts in the comparative period are classified as current and long term in the statement of financial position.