v3.25.2
Cover Page
 6 Months Ended
Jun. 28, 2025
shares
Entity Information [Line Items]  
Document Type 10-Q
Document Quarterly Report true
Entity Registrant Name Kellanova
Document Period End Date Jun. 28, 2025
Document Transition Report false
Entity File Number 1-4171
Entity Incorporation, State or Country Code DE
Entity Tax Identification Number 38-0710690
Entity Address, Address Line One 412 N. Wells Street
Entity Address, City or Town Chicago
Entity Address, State or Province IL
Entity Address, Postal Zip Code 60654
City Area Code 269
Local Phone Number 961-2000
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
Entity Shell Company false
Entity Common Stock, Shares Outstanding (in shares) 347,669,200
Amendment Flag false
Document Fiscal Period Focus Q2
Document Fiscal Year Focus 2025
Entity Central Index Key 0000055067
Current Fiscal Year End Date --01-03
Common Stock, $.25 par value per share [Member]  
Entity Information [Line Items]  
Title of 12(b) Security Common Stock, $.25 par value per share
Trading Symbol K
Security Exchange Name NYSE
0.500% Senior Notes Due 2029  
Entity Information [Line Items]  
Title of 12(b) Security 0.500% Senior Notes due 2029
Trading Symbol K 29
Security Exchange Name NYSE
3.750% Senior Notes Due 2034  
Entity Information [Line Items]  
Title of 12(b) Security 3.750% Senior Notes due 2034
Trading Symbol K 34
Security Exchange Name NYSE