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Shareholders' Equity: (Details 3) (Stock options, USD $) | 12 Months Ended
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Dec. 27, 2014 | Dec. 28, 2013 | Dec. 29, 2012
Additional disclosures |  |  |
Compensation expense | $ 1,417,200 us-gaap_AllocatedShareBasedCompensationExpense | $ 1,153,600 us-gaap_AllocatedShareBasedCompensationExpense | $ 930,200 us-gaap_AllocatedShareBasedCompensationExpense
Total unrecognized compensation expense | 3,800,000 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions |  |
Weighted average period for recognition of unrecognized compensation expense | 2 years 7 months 6 days |  |
Total intrinsic value of options exercised | 1,200,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue | 8,700,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue | 7,400,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue
Total fair value of shares vested | $ 5,100,000 us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1 | $ 3,900,000 us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1 | $ 2,800,000 us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1
Shares of previously owned common stock surrendered as payment for option shares exercised | 0 wina_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesSurrenderedForPaymentOfOptionsExercised | 1,207 wina_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesSurrenderedForPaymentOfOptionsExercised | 31,351 wina_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesSurrenderedForPaymentOfOptionsExercised
Options Outstanding |  |  |
Number Outstanding (in shares) |  | 597,700 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions |
Weighted Average Remaining Contractual Life |  | 6 years 11 months 5 days |
Weighted Average Exercise Price (in dollars per share) |  | $ 48.50 us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1 |
Options Exercisable |  |  |
Number Exercisable (in shares) |  | 350,122 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions |
Weighted Average Exercise Price (in dollars per share) |  | $ 36.24 us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1 |
$12.75 - $18.40 |  |  |
Stock options outstanding and exercisable |  |  |
Range of Exercise Price, low end of range (in dollars per share) |  | $ 12.75 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit / us-gaap_AwardTypeAxis = wina_EmployeeAndDirectorsStockOptionsMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = wina_ExercisePriceRangeOneMember |
Range of Exercise Price, high end of range (in dollars per share) |  | $ 18.40 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit / us-gaap_AwardTypeAxis = wina_EmployeeAndDirectorsStockOptionsMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = wina_ExercisePriceRangeOneMember |
Options Outstanding |  |  |
Number Outstanding (in shares) |  | 52,261 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions / us-gaap_AwardTypeAxis = wina_EmployeeAndDirectorsStockOptionsMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = wina_ExercisePriceRangeOneMember |
Weighted Average Remaining Contractual Life |  | 4 years 4 days |
Weighted Average Exercise Price (in dollars per share) |  | $ 13.97 us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1 / us-gaap_AwardTypeAxis = wina_EmployeeAndDirectorsStockOptionsMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = wina_ExercisePriceRangeOneMember |
Options Exercisable |  |  |
Number Exercisable (in shares) |  | 52,261 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions / us-gaap_AwardTypeAxis = wina_EmployeeAndDirectorsStockOptionsMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = wina_ExercisePriceRangeOneMember |
Weighted Average Exercise Price (in dollars per share) |  | $ 13.97 us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1 / us-gaap_AwardTypeAxis = wina_EmployeeAndDirectorsStockOptionsMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = wina_ExercisePriceRangeOneMember |
$20.32 - $31.19 |  |  |
Stock options outstanding and exercisable |  |  |
Range of Exercise Price, low end of range (in dollars per share) |  | $ 20.32 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit / us-gaap_AwardTypeAxis = wina_EmployeeAndDirectorsStockOptionsMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = wina_ExercisePriceRangeTwoMember |
Range of Exercise Price, high end of range (in dollars per share) |  | $ 31.19 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit / us-gaap_AwardTypeAxis = wina_EmployeeAndDirectorsStockOptionsMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = wina_ExercisePriceRangeTwoMember |
Options Outstanding |  |  |
Number Outstanding (in shares) |  | 107,689 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions / us-gaap_AwardTypeAxis = wina_EmployeeAndDirectorsStockOptionsMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = wina_ExercisePriceRangeTwoMember |
Weighted Average Remaining Contractual Life |  | 4 years 3 months 22 days |
Weighted Average Exercise Price (in dollars per share) |  | $ 25.28 us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1 / us-gaap_AwardTypeAxis = wina_EmployeeAndDirectorsStockOptionsMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = wina_ExercisePriceRangeTwoMember |
Options Exercisable |  |  |
Number Exercisable (in shares) |  | 107,689 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions / us-gaap_AwardTypeAxis = wina_EmployeeAndDirectorsStockOptionsMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = wina_ExercisePriceRangeTwoMember |
Weighted Average Exercise Price (in dollars per share) |  | $ 25.28 us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1 / us-gaap_AwardTypeAxis = wina_EmployeeAndDirectorsStockOptionsMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = wina_ExercisePriceRangeTwoMember |
$32.92 - $51.17 |  |  |
Stock options outstanding and exercisable |  |  |
Range of Exercise Price, low end of range (in dollars per share) |  | $ 32.92 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit / us-gaap_AwardTypeAxis = wina_EmployeeAndDirectorsStockOptionsMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = wina_ExercisePriceRangeThreeMember |
Range of Exercise Price, high end of range (in dollars per share) |  | $ 51.17 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit / us-gaap_AwardTypeAxis = wina_EmployeeAndDirectorsStockOptionsMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = wina_ExercisePriceRangeThreeMember |
Options Outstanding |  |  |
Number Outstanding (in shares) |  | 132,000 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions / us-gaap_AwardTypeAxis = wina_EmployeeAndDirectorsStockOptionsMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = wina_ExercisePriceRangeThreeMember |
Weighted Average Remaining Contractual Life |  | 6 years 7 months 6 days |
Weighted Average Exercise Price (in dollars per share) |  | $ 40.77 us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1 / us-gaap_AwardTypeAxis = wina_EmployeeAndDirectorsStockOptionsMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = wina_ExercisePriceRangeThreeMember |
Options Exercisable |  |  |
Number Exercisable (in shares) |  | 98,309 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions / us-gaap_AwardTypeAxis = wina_EmployeeAndDirectorsStockOptionsMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = wina_ExercisePriceRangeThreeMember |
Weighted Average Exercise Price (in dollars per share) |  | $ 38.71 us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1 / us-gaap_AwardTypeAxis = wina_EmployeeAndDirectorsStockOptionsMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = wina_ExercisePriceRangeThreeMember |
$53.34 - $82.72 |  |  |
Stock options outstanding and exercisable |  |  |
Range of Exercise Price, low end of range (in dollars per share) |  | $ 53.34 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit / us-gaap_AwardTypeAxis = wina_EmployeeAndDirectorsStockOptionsMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = wina_ExercisePriceRangeFourMember |
Range of Exercise Price, high end of range (in dollars per share) |  | $ 82.72 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit / us-gaap_AwardTypeAxis = wina_EmployeeAndDirectorsStockOptionsMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = wina_ExercisePriceRangeFourMember |
Options Outstanding |  |  |
Number Outstanding (in shares) |  | 305,750 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions / us-gaap_AwardTypeAxis = wina_EmployeeAndDirectorsStockOptionsMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = wina_ExercisePriceRangeFourMember |
Weighted Average Remaining Contractual Life |  | 8 years 6 months |
Weighted Average Exercise Price (in dollars per share) |  | $ 65.92 us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1 / us-gaap_AwardTypeAxis = wina_EmployeeAndDirectorsStockOptionsMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = wina_ExercisePriceRangeFourMember |
Options Exercisable |  |  |
Number Exercisable (in shares) |  | 91,863 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions / us-gaap_AwardTypeAxis = wina_EmployeeAndDirectorsStockOptionsMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = wina_ExercisePriceRangeFourMember |
Weighted Average Exercise Price (in dollars per share) |  | $ 59.10 us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1 / us-gaap_AwardTypeAxis = wina_EmployeeAndDirectorsStockOptionsMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = wina_ExercisePriceRangeFourMember |

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