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Shareholders' Equity: (Details 2) (USD $)
12 Months Ended
Dec. 27, 2014
Dec. 28, 2013
Dec. 29, 2012
Dec. 31, 2011
Apr. 30, 2014
Dec. 25, 2010
Stock options            
Number of Shares            
Outstanding at the beginning of the period (in shares) 526,712us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= wina_EmployeeAndDirectorsStockOptionsMember
613,727us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= wina_EmployeeAndDirectorsStockOptionsMember
668,614us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= wina_EmployeeAndDirectorsStockOptionsMember
     
Granted (in shares) 97,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_AwardTypeAxis
= wina_EmployeeAndDirectorsStockOptionsMember
96,250us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_AwardTypeAxis
= wina_EmployeeAndDirectorsStockOptionsMember
120,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_AwardTypeAxis
= wina_EmployeeAndDirectorsStockOptionsMember
     
Exercised (in shares) (21,012)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
/ us-gaap_AwardTypeAxis
= wina_EmployeeAndDirectorsStockOptionsMember
(176,700)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
/ us-gaap_AwardTypeAxis
= wina_EmployeeAndDirectorsStockOptionsMember
(174,887)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
/ us-gaap_AwardTypeAxis
= wina_EmployeeAndDirectorsStockOptionsMember
     
Forfeited (in shares) (5,000)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod
/ us-gaap_AwardTypeAxis
= wina_EmployeeAndDirectorsStockOptionsMember
(6,565)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod
/ us-gaap_AwardTypeAxis
= wina_EmployeeAndDirectorsStockOptionsMember
       
Outstanding at the end of the period (in shares) 597,700us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= wina_EmployeeAndDirectorsStockOptionsMember
526,712us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= wina_EmployeeAndDirectorsStockOptionsMember
613,727us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= wina_EmployeeAndDirectorsStockOptionsMember
668,614us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= wina_EmployeeAndDirectorsStockOptionsMember
   
Exercisable at the end of the period (in shares) 350,122us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
/ us-gaap_AwardTypeAxis
= wina_EmployeeAndDirectorsStockOptionsMember
         
Weighted Average Exercise Price            
Outstanding at the beginning of the period (in dollars per share) $ 42.87us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= wina_EmployeeAndDirectorsStockOptionsMember
$ 31.46us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= wina_EmployeeAndDirectorsStockOptionsMember
$ 24.31us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= wina_EmployeeAndDirectorsStockOptionsMember
     
Granted (in dollars per share) $ 73.31us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= wina_EmployeeAndDirectorsStockOptionsMember
$ 71.39us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= wina_EmployeeAndDirectorsStockOptionsMember
$ 54.26us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= wina_EmployeeAndDirectorsStockOptionsMember
     
Exercised (in dollars per share) $ 19.89us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= wina_EmployeeAndDirectorsStockOptionsMember
$ 18.82us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= wina_EmployeeAndDirectorsStockOptionsMember
$ 19.77us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= wina_EmployeeAndDirectorsStockOptionsMember
     
Forfeited (in dollars per share) $ 56.85us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= wina_EmployeeAndDirectorsStockOptionsMember
$ 42.20us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= wina_EmployeeAndDirectorsStockOptionsMember
       
Outstanding at the end of the period (in dollars per share) $ 48.50us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= wina_EmployeeAndDirectorsStockOptionsMember
$ 42.87us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= wina_EmployeeAndDirectorsStockOptionsMember
$ 31.46us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= wina_EmployeeAndDirectorsStockOptionsMember
$ 24.31us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= wina_EmployeeAndDirectorsStockOptionsMember
   
Exercisable at the end of the period (in dollars per share) $ 36.24us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= wina_EmployeeAndDirectorsStockOptionsMember
         
Weighted Average Remaining Contractual Life (years)            
Outstanding 6 years 11 months 5 days 7 years 3 months 29 days 7 years 22 days 6 years 7 months 13 days    
Exercisable at the end of the period 5 years 8 months 27 days          
Intrinsic Value            
Outstanding at the beginning of the period $ 26,446,700us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
/ us-gaap_AwardTypeAxis
= wina_EmployeeAndDirectorsStockOptionsMember
$ 16,010,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
/ us-gaap_AwardTypeAxis
= wina_EmployeeAndDirectorsStockOptionsMember
$ 22,101,800us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
/ us-gaap_AwardTypeAxis
= wina_EmployeeAndDirectorsStockOptionsMember
     
Outstanding at the end of the period 20,973,700us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
/ us-gaap_AwardTypeAxis
= wina_EmployeeAndDirectorsStockOptionsMember
26,446,700us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
/ us-gaap_AwardTypeAxis
= wina_EmployeeAndDirectorsStockOptionsMember
16,010,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
/ us-gaap_AwardTypeAxis
= wina_EmployeeAndDirectorsStockOptionsMember
22,101,800us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
/ us-gaap_AwardTypeAxis
= wina_EmployeeAndDirectorsStockOptionsMember
   
Exercisable at the end of the period $ 16,580,000us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1
/ us-gaap_AwardTypeAxis
= wina_EmployeeAndDirectorsStockOptionsMember
         
Weighted average assumptions and results used in estimation of fair value of options granted            
Risk free interest rate (as a percent) 1.75%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
/ us-gaap_AwardTypeAxis
= wina_EmployeeAndDirectorsStockOptionsMember
1.60%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
/ us-gaap_AwardTypeAxis
= wina_EmployeeAndDirectorsStockOptionsMember
0.88%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
/ us-gaap_AwardTypeAxis
= wina_EmployeeAndDirectorsStockOptionsMember
     
Expected life (years) 6 years 6 years 6 years      
Expected volatility (as a percent) 33.20%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
/ us-gaap_AwardTypeAxis
= wina_EmployeeAndDirectorsStockOptionsMember
32.90%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
/ us-gaap_AwardTypeAxis
= wina_EmployeeAndDirectorsStockOptionsMember
31.90%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
/ us-gaap_AwardTypeAxis
= wina_EmployeeAndDirectorsStockOptionsMember
     
Dividend yield (as a percent) 1.66%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate
/ us-gaap_AwardTypeAxis
= wina_EmployeeAndDirectorsStockOptionsMember
1.65%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate
/ us-gaap_AwardTypeAxis
= wina_EmployeeAndDirectorsStockOptionsMember
2.05%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate
/ us-gaap_AwardTypeAxis
= wina_EmployeeAndDirectorsStockOptionsMember
     
Option fair value (in dollars per share) $ 21.02us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= wina_EmployeeAndDirectorsStockOptionsMember
$ 20.36us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= wina_EmployeeAndDirectorsStockOptionsMember
$ 13.43us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= wina_EmployeeAndDirectorsStockOptionsMember
     
2001 Plan            
Stock option plans            
Number of shares authorized for issuance       750,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= wina_StockOptionPlan2001Member
   
2001 Plan | Stock options | Minimum            
Stock option plans            
Exercise price of stock options as a percentage of fair value on the date of grant 100.00%wina_ShareBasedCompensationArrangementByShareBasedPaymentAwardExercisePriceAsPercentageOfGrantDateFairValue
/ us-gaap_AwardTypeAxis
= wina_EmployeeAndDirectorsStockOptionsMember
/ us-gaap_PlanNameAxis
= wina_StockOptionPlan2001Member
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
         
2010 Plan | Stock options            
Stock option plans            
Number of shares authorized for issuance         500,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_AwardTypeAxis
= wina_EmployeeAndDirectorsStockOptionsMember
/ us-gaap_PlanNameAxis
= wina_StockOptionPlan2010Member
250,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_AwardTypeAxis
= wina_EmployeeAndDirectorsStockOptionsMember
/ us-gaap_PlanNameAxis
= wina_StockOptionPlan2010Member
2010 Plan | Stock options | Minimum            
Stock option plans            
Exercise price of stock options as a percentage of fair value on the date of grant for an individual who owns more than 10% of voting rights 110.00%wina_ShareBasedCompensationArrangementByShareBasedPaymentAwardExercisePriceAsPercentageOfGrantDateFairValueForIndividualsHoldingMoreThanTenPercentOfVotingRights
/ us-gaap_AwardTypeAxis
= wina_EmployeeAndDirectorsStockOptionsMember
/ us-gaap_PlanNameAxis
= wina_StockOptionPlan2010Member
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
         
Exercise price of stock options as a percentage of fair value on the date of grant 100.00%wina_ShareBasedCompensationArrangementByShareBasedPaymentAwardExercisePriceAsPercentageOfGrantDateFairValue
/ us-gaap_AwardTypeAxis
= wina_EmployeeAndDirectorsStockOptionsMember
/ us-gaap_PlanNameAxis
= wina_StockOptionPlan2010Member
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
         
Threshold voting rights above which the option exercise price may not be less than 110% of the fair market value (as a percent) 10.00%wina_ShareBasedCompensationArrangementByShareBasedPaymentAwardThresholdPercentageOfVotingInterestForSpecifiedExercisePrice
/ us-gaap_AwardTypeAxis
= wina_EmployeeAndDirectorsStockOptionsMember
/ us-gaap_PlanNameAxis
= wina_StockOptionPlan2010Member
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
         
2010 Plan | Stock options | Maximum            
Stock option plans            
Term of the option 10 years          
Nonemployee Directors Plan | Stock options            
Stock option plans            
Number of shares authorized for issuance   300,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_AwardTypeAxis
= wina_EmployeeAndDirectorsStockOptionsMember
/ us-gaap_PlanNameAxis
= wina_StockOptionPlanForNonemployeeDirectorsMember
    350,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_AwardTypeAxis
= wina_EmployeeAndDirectorsStockOptionsMember
/ us-gaap_PlanNameAxis
= wina_StockOptionPlanForNonemployeeDirectorsMember