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Document and Entity Information - shares
 9 Months Ended
Sep. 28, 2019
Oct. 31, 2019
Document and Entity Information [Abstract]    
Document Type 10-Q  
Document Period End Date Sep. 28, 2019  
Entity File Number 1-10435  
Entity Interactive Data Current Yes  
Entity Current Reporting Status Yes  
Entity Registrant Name STURM, RUGER & COMPANY, INC.  
Entity Incorporation, State or Country Code DE  
Entity Address, City or Town Southport  
Entity Address, State or Province CT  
Entity Tax Identification Number 06-0633559  
Entity Address, Address Line One Lacey Place  
Entity Address, Postal Zip Code 06890  
Local Phone Number 259-7843  
Entity Common Stock, Shares Outstanding   17,485,330
Entity Central Index Key 0000095029  
Current Fiscal Year End Date --12-31  
Entity Filer Category Large Accelerated Filer  
Document Fiscal Year Focus 2019  
Document Fiscal Period Focus Q3  
Amendment Flag false  
Entity Emerging Growth Company false  
Entity Small Business false  
Entity Shell Company false  
City Area Code 203  
Document Quarterly Report true  
Document Transition Report false  
Trading Symbol RGR  
Security 12b Title Common Stock, $1 par value  
Name of Exchange on which Security is Registered NYSE