Document and Entity Information
Mar. 31, 2022
Document And Entity Information [Line Items]  
Document Type 8-K
Document Period End Date Mar. 31, 2022
Entity Registrant Name ATMOS ENERGY CORP
Entity Incorporation, State or Country Code TX
Entity File Number 1-10042
Entity Tax Identification Number 75-1743247
Entity Address, Address Line One 1800 THREE LINCOLN CENTRE
Entity Address, Address Line Two 5430 LBJ FREEWAY
Entity Address, City or Town DALLAS
Entity Address, State or Province TX
Entity Address, Postal Zip Code 75240
City Area Code 972
Local Phone Number 934-9227
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Title of 12(b) Security Common stock, No Par Value
Trading Symbol ATO
Security Exchange Name NYSE
Entity Emerging Growth Company false
Entity Central Index Key 0000731802
Amendment Flag false
VIRGINIA [Member]  
Document And Entity Information [Line Items]  
Entity Incorporation, State or Country Code VA