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Subsequent Events (Details) - USD ($)
$ in Millions
Oct. 29, 2016
Oct. 25, 2016
Oct. 20, 2016
Oct. 05, 2016
Sep. 30, 2016
Subsequent Event [Member]          
Subsequent Event [Line Items]          
Subsequent Event, Date Oct. 29, 2016 Oct. 25, 2016 Oct. 20, 2016 Oct. 05, 2016  
Subsequent Event, Description
AEH entered into a Membership Interest Purchase Agreement (the Agreement) with CenterPoint Energy Services, Inc., a subsidiary of CenterPoint Energy, Inc. to sell all of the equity interests of AEM for $40.0 million plus working capital at the date of closing. No material gain or loss is currently anticipated in connection with the closing of this transaction. We expect this transaction to close during the second quarter of fiscal 2017.
the uncommitted $25 million 364-day bilateral credit facility was renewed through July 31, 2017.
the Society of Actuaries released its annually-updated mortality improvement scale for pension plans incorporating new assumptions surrounding life expectancies in the United States.  As of September 30, 2016, we updated our assumed mortality rates to incorporate the updated mortality table.
we amended our existing $1.25 billion unsecured credit facility (the five-year unsecured credit facility) which increased the committed loan to $1.5 billion and extended the facility through September 25, 2021.
 
Atmos Energy Marketing [Member]          
Disposal Group, Including Discontinued Operation, Liabilities [Abstract]          
Disposal Group, Including Discontinued Operation, Consideration         $ 40.0
Atmos Energy Marketing [Member] | Disposal Group, Not Discontinued Operations [Member]          
Disposal Group, Including Discontinued Operation, Assets [Abstract]          
Net property, plant and equipment         13.0
Accounts receivable         94.0
Gas stored underground         56.0
Other current assets         13.0
Goodwill         15.0
Deferred charges and other assets         0.3
Total assets included in disposal group         191.3
Disposal Group, Including Discontinued Operation, Liabilities [Abstract]          
Accounts payable and accrued liabilities         71.0
Other current liabilities         8.0
Deferred credits and other         0.2
Total liabilities included in disposal group         $ 79.2