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Document and Entity Information (USD $)
 12 Months Ended
Dec. 29, 2012
Mar. 04, 2013
Jun. 30, 2012
Document and Entity Information      
Entity Registrant Name WINMARK CORP    
Entity Central Index Key 0000908315    
Document Type 10-K    
Document Period End Date Dec. 29, 2012    
Amendment Flag false    
Current Fiscal Year End Date --12-31    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Filer Category Accelerated Filer    
Entity Public Float     $ 80,508,943
Entity Common Stock, Shares Outstanding   4,999,647  
Document Fiscal Year Focus 2012    
Document Fiscal Period Focus FY