Document Fiscal Period Focus Document Fiscal Period Focus Auditor Firm ID Auditor Firm ID Entity Shell Company Entity Shell Company Entity Voluntary Filers Entity Voluntary Filers Documents Incorporated by Reference Documents Incorporated by Reference [Text Block] Entity Interactive Data Current Entity Interactive Data Current Auditor Name Auditor Name Document Period End Date Document Period End Date Entity Common Stock Shares Outstanding Entity Common Stock, Shares Outstanding City Area Code City Area Code Entity Address, Postal Zip Code Entity Address, Postal Zip Code Entity Well Known Seasoned Issuer Entity Well-known Seasoned Issuer Entity Central Index Key Entity Central Index Key Entity Current Reporting Status Entity Current Reporting Status Entity Filer Category Entity Filer Category Document Fiscal Year Focus Document Fiscal Year Focus Entity Address, City or Town Entity Address, City or Town Current Fiscal Year End Date Current Fiscal Year End Date Entity Small Business Entity Small Business Document Information [Line Items] Document Information [Line Items] Local Phone Number Local Phone Number Atmos Energy Corporation Atmos Energy Corporation [Member] Atmos Energy Corporation Auditor Information [Abstract] Auditor Information Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Document Annual Report Document Annual Report ICFR Auditor Attestation Flag ICFR Auditor Attestation Flag Entity Address, State or Province Entity Address, State or Province Document Transition Report Document Transition Report Document Financial Statement Error Correction [Flag] Document Financial Statement Error Correction [Flag] Cover [Abstract] Entity Emerging Growth Company Entity Emerging Growth Company Entity [Domain] Entity [Domain] Document Type Document Type Amendment Flag Amendment Flag Document Information [Table] Document Information [Table] Entity File Number Entity File Number Legal Entity [Axis] Legal Entity [Axis] Entity Tax Identification Number Entity Tax Identification Number Entity Public Float Entity Public Float Entity Address, Address Line One Entity Address, Address Line One Auditor Location Auditor Location Entity Address, Address Line Two Entity Address, Address Line Two Entity Registrant Name Entity Registrant Name