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Divestitures and Acquisitions (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Jan. 01, 2017
Dec. 31, 2016
Dec. 31, 2015
Sep. 30, 2016
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract]        
Net income from discontinued operations   $ 10,994 $ 1,315  
Subsequent Event [Line Items]        
Disposal Group, Including Discontinued Operation, Cash Purchase Price $ 38,300      
Disposal Group, Including Discontinued Operation, Estimated Working Capital 103,200      
Disposal Group, Including Discontinued Operation, Consideration Placed in Escrow $ 7,000      
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 an all–cash price of $85 million, plus estimated working capital. After considering estimated working capital, the total proceeds paid were $85.7 million. The final purchase is subject to adjustment after the estimated working capital is finalized during the second quarter of fiscal 2017.

EnLink Pipeline's primary asset is a 140–mile natural gas pipeline located on the north side of the Dallas–Fort Worth Metroplex. As of December 31, 2016, the $85 million purchase price was preliminarily allocated, based on fair value using observable market inputs, to the net book value of the acquired pipeline. The final purchase price allocation is subject to adjustment pending the completion of analysis of the fair value of certain contracts included in the acquisition. We expect to complete this evaluation during the second quarter of fiscal 2017.
    
Subsequent Event [Member]        
Subsequent Event [Line Items]        
Subsequent Event, Date Jan. 01, 2017      
Disposal Group, Including Discontinued Operation, Consideration $ 141,500      
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax, Per Diluted Share $ 0.03      
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   $ 303,474 259,258  
Purchased gas cost   277,554 249,789  
Gross profit   25,920 9,469  
Operating expenses   7,874 5,993  
Operating income   18,046 3,476  
Other nonoperating expense   (211) (1,276)  
Income from discontinued operations before income taxes   17,835 2,200  
Income tax expense   6,841 885  
Net income from discontinued operations   10,994 1,315  
Assets [Abstract]        
Total assets of the disposal group   248,017   $ 216,715
Liabilities [Abstract]        
Total liabilities of the disposal group   145,179   150,013
Discontinued Operation, Alternative Cash Flow Information [Abstract]        
Depreciation and Amortization, Discontinued Operations   185 583  
Capital Expenditure, Discontinued Operations   0 24  
Noncash Change in Commodity Contract Cash Flow Hedges   18,744 $ 3,858  
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   11,599   11,905
Accounts receivable   139,741   93,551
Gas stored underground   77,559   54,246
Other current assets   9,447   14,711
Goodwill [1]   13,734   16,445
Deferred charges and other assets   1,870   435
Total assets of the disposal group [2]   253,950   191,293
Liabilities [Abstract]        
Accounts payable and accrued liabilities   113,368   72,268
Other current liabilities   6,876   9,640
Deferred credits and other   322   316
Total liabilities of the disposal group [2]   120,566   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   891   25,417
Other assets   (6,824)   5
Liabilities [Abstract]        
Intercompany note payable   0   35,000
Tax liabilities   19,469   15,471
Intercompany payables   4,108   14,139
Other liabilities   $ 1,036   $ 3,179
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    
Business Combination, Consideration Transferred   $ 85,700    
[1] The period-over-period change in natural gas marketing goodwill is the result of the reallocation of goodwill between the retained portion and held-for-sale portion of the former Atmos Energy Marketing reporting unit, based on relative fair value.
[2] Amounts in the comparative period are classified as current and long term in the statement of financial position.