| Document and Entity Information | Jun. 20, 2023 |
| Cover [Abstract] | |
| Entity Registrant Name | ATMOS ENERGY CORP |
| Entity Incorporation State Country Code | TX |
| Amendment Flag | false |
| Entity Central Index Key | 0000731802 |
| Document Type | 8-K |
| Document Period End Date | Jun. 20, 2023 |
| Entity Tax Identification Number | 75-1743247 |
| Entity Address, Address Line One | ATMOS ENERGY KANSAS |
| Entity Address, Address Line Two | SECURITIZATION I |
| Entity Address, Address Line Three | LLC |
| Entity Address, City or Town | Dallas |
| Entity Address, State or Province | TX |
| Entity Address, Postal Zip Code | 75240 |
| Local Phone Number | 934-9227 |
| City Area Code | (972) |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Security 12b Title | Common Stock, No Par Value |
| Trading Symbol | ATO |
| Security Exchange Name | NYSE |
| Entity Emerging Growth Company | false |
