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Cover - shares
 9 Months Ended
Sep. 28, 2019
Oct. 11, 2019
Cover page.    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Sep. 28, 2019  
Document Transition Report false  
Entity File Number 1-7724  
Entity Registrant Name Snap-on Inc  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 39-0622040  
Entity Address, Address Line One 2801 80th Street  
Entity Address, City or Town Kenosha  
Entity Address, State or Province WI  
Entity Address, Postal Zip Code 53143  
City Area Code 262  
Local Phone Number 656-5200  
Title of 12(b) Security Common Stock, $1.00 par value  
Trading Symbol SNA  
Security Exchange Name NYSE  
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)   54,846,349
Amendment Flag false  
Document Fiscal Year Focus 2019  
Document Fiscal Period Focus Q3  
CIK 0000091440  
Current Fiscal Year End Date --12-28