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Cover
 12 Months Ended
Sep. 30, 2025
USD ($)
shares
Document Information [Line Items]  
Document Type 10-K
Document Annual Report true
Document Period End Date Sep. 30, 2025
Current Fiscal Year End Date --09-30
Document Transition Report false
Entity File Number 333-270078-01
Entity Central Index Key 0001967097
Entity Registrant Name Atmos Energy Kansas Securitization I, LLC
Entity Incorporation, State or Country Code DE
Entity Tax Identification Number 92-1021026
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
Entity Well Known Seasoned Issuer No
Entity Voluntary Filers No
Entity Current Reporting Status Yes
Entity Interactive Data Current Yes
Entity Filer Category Non-accelerated Filer
Entity Small Business false
Entity Emerging Growth Company false
ICFR Auditor Attestation Flag false
Document Financial Statement Error Correction [Flag] false
Entity Shell Company false
Documents Incorporated by Reference
Portions of the Definitive Proxy Statement to be filed for Atmos Energy Corporation’s Annual Meeting of Shareholders on February 4, 2026 are incorporated by reference into Part III of this report.
Entity Public Float | $ $ 0
Entity Common Stock Shares Outstanding | shares 0
Document Fiscal Year Focus 2025
Document Fiscal Period Focus FY
Amendment Flag false
Atmos Energy Corporation  
Document Information [Line Items]  
Entity File Number 001-10042
Entity Central Index Key 0000731802
Entity Registrant Name Atmos Energy Corporation