XML 14 R1.htm IDEA: XBRL DOCUMENT v3.8.0.1
Document and Entity Information - USD ($)
 12 Months Ended
Dec. 30, 2017
Mar. 05, 2018
Jul. 01, 2017
Document and Entity Information      
Entity Registrant Name WINMARK CORP    
Entity Central Index Key 0000908315    
Document Type 10-K    
Document Period End Date Dec. 30, 2017    
Amendment Flag false    
Current Fiscal Year End Date --12-30    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Filer Category Accelerated Filer    
Entity Public Float     $ 316,418,727
Entity Common Stock, Shares Outstanding   3,849,506  
Document Fiscal Year Focus 2017    
Document Fiscal Period Focus FY