XML 18 R1.htm IDEA: XBRL DOCUMENT v3.25.0.1
Cover Page - USD ($)
$ in Billions
 12 Months Ended
Dec. 28, 2024
Feb. 14, 2025
Jun. 28, 2024
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 28, 2024    
Document Transition Report false    
Entity File Number 1-41755    
Entity Registrant Name WK Kellogg Co    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 92-1243173    
Entity Address, Address Line One One Kellogg Square    
Entity Address, City or Town Battle Creek    
Entity Address, State or Province MI    
Entity Address, Postal Zip Code 49016-3599    
City Area Code 269    
Local Phone Number 401-3000    
Title of 12(b) Security Common Stock par value, $.0001 per share    
Trading Symbol KLG    
Security Exchange Name NYSE    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag false    
Document Financial Statement Error Correction false    
Entity Shell Company false    
Entity Public Float     $ 1.4
Entity Common Stock, Shares Outstanding   86,196,959  
Documents Incorporated by Reference Parts of the registrant’s definitive proxy statement for the registrant’s 2025 Annual Meeting of Shareowners are incorporated by reference into Part III of this Annual Report on Form 10-K. The proxy statement will be filed with the U.S. Securities and Exchange Commission within 120 days after the end of the fiscal year to which this report relates.    
Amendment Flag false    
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2024    
Entity Central Index Key 0001959348    
Current Fiscal Year End Date --12-28