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Nature of Business (Table)
12 Months Ended
Sep. 30, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Schedule of divisions and service areas Through our distribution business, we deliver natural gas through sales and transportation arrangements to over three million residential, commercial, public-authority and industrial customers through our six regulated distribution divisions in the service areas described below:
Division  Service Area
Atmos Energy Colorado-Kansas Division  Colorado, Kansas
Atmos Energy Kentucky/Mid-States Division  
Kentucky, Tennessee, Virginia(1)
Atmos Energy Louisiana Division  Louisiana
Atmos Energy Mid-Tex Division  Texas, including the Dallas/Fort Worth metropolitan area
Atmos Energy Mississippi Division  Mississippi
Atmos Energy West Texas Division  West Texas
 
(1)Denotes location where we have more limited service areas.