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Cover - shares
 3 Months Ended 6 Months Ended
Jun. 29, 2019
Jun. 29, 2019
Jul. 27, 2019
Cover page.      
Document Type   10-Q  
Document Quarterly Report   true  
Document Period End Date   Jun. 29, 2019  
Document Transition Report   false  
Entity File Number 000-23314    
Entity Registrant Name   TRACTOR SUPPLY CO /DE/  
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 13-3139732    
Entity Address, Street Address   5401 Virginia Way  
Entity Address, City   Brentwood  
Entity Address, State   TN  
Entity Address, Postal Zip Code   37027  
City Area Code   615  
Local Phone Number   440-4000  
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  
Title of each class   Common Stock, $0.008 par value  
Trading Symbol   TSCO  
Name of each exchange on which registered   NASDAQ  
Entity Central Index Key   0000916365  
Entity Common Stock, Shares Outstanding     119,264,959
Current Fiscal Year End Date   --12-28  
Document Fiscal Year Focus   2019  
Document Fiscal Period Focus   Q2  
Amendment Flag   false