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Equity-Based Compensation (Narrative) (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended 1 Months Ended 0 Months Ended 2 Months Ended
Apr. 01, 2015
Mar. 26, 2014
Feb. 03, 2015
Feb. 04, 2015
Apr. 01, 2015
Dec. 31, 2014
Jan. 01, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Equity-based compensation expense $ 13,159us-gaap_AllocatedShareBasedCompensationExpense $ 41us-gaap_AllocatedShareBasedCompensationExpense          
LLC interests              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
IPO qualifying transaction price (in USD per share) $ 715.02shak_StockholdersEquityIPOQualifyingTransactionPrice
/ us-gaap_AwardTypeAxis
= shak_LimitedLiabilityCompanyInterestsMember
           
Unit appreciation rights              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Equity-based compensation expense 11,762us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember
0us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember
         
Restricted Class B units              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Equity-based compensation expense 605us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
41us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
         
Restricted class B units vested 7,227us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
           
Restricted class B units weighted average grant date fair value vested (in USD per share) $ 92.31us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
           
Fair value of restricted Class B units vested in the period 667us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
           
Stock options              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Equity-based compensation expense 792us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
0us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
         
Minimum | Restricted Class B units              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Award vesting period     3 years        
Maximum | Restricted Class B units              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Award vesting period     5 years        
Common stock | Class A common stock              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Issuance of class A common stock in settlement of unit appreciation rights (shares) 339,306us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
    339,306us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
339,306us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
   
Pro forma | LLC interests              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Restricted class B units vested 158,251us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= shak_LimitedLiabilityCompanyInterestsMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ProFormaMember
           
Restricted class B units weighted average grant date fair value vested (in USD per share) $ 4.22us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= shak_LimitedLiabilityCompanyInterestsMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ProFormaMember
           
Unit Appreciation Rights Plan | Unit appreciation rights              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of shares available for grant     31,303us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember
/ us-gaap_PlanNameAxis
= shak_UnitAppreciationRightsPlanMember
       
Contractual term     10 years        
Unit appreciation rights vested and settled 22,554us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExercised
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember
/ us-gaap_PlanNameAxis
= shak_UnitAppreciationRightsPlanMember
           
Weighted average base price of unit appreciation rights vested and settled $ 193.51shak_SharebasedCompensationArrangementsbySharebasedPaymentAwardNonOptionEquityInstrumentsExercisesinPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember
/ us-gaap_PlanNameAxis
= shak_UnitAppreciationRightsPlanMember
           
Unit Appreciation Rights Plan | Pro forma | LLC interests              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Unit appreciation rights vested and settled 767,947us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExercised
/ us-gaap_AwardTypeAxis
= shak_LimitedLiabilityCompanyInterestsMember
/ us-gaap_PlanNameAxis
= shak_UnitAppreciationRightsPlanMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ProFormaMember
           
Weighted average base price of unit appreciation rights vested and settled $ 5.68shak_SharebasedCompensationArrangementsbySharebasedPaymentAwardNonOptionEquityInstrumentsExercisesinPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= shak_LimitedLiabilityCompanyInterestsMember
/ us-gaap_PlanNameAxis
= shak_UnitAppreciationRightsPlanMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ProFormaMember
           
2015 Incentive Award Plan              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Stock options granted in the period 2,622,281us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_PlanNameAxis
= shak_TwoThousandTwentyFifteenIncentiveAwardPlanMember
           
Weighted average exercise price for stock options granted (in USD per share) $ 21.00us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
/ us-gaap_PlanNameAxis
= shak_TwoThousandTwentyFifteenIncentiveAwardPlanMember
           
Weighted average grant date fair value of stock options (in USD per share) $ 8.53us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_PlanNameAxis
= shak_TwoThousandTwentyFifteenIncentiveAwardPlanMember
           
Stock options outstanding 2,618,281us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_PlanNameAxis
= shak_TwoThousandTwentyFifteenIncentiveAwardPlanMember
      2,618,281us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_PlanNameAxis
= shak_TwoThousandTwentyFifteenIncentiveAwardPlanMember
0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_PlanNameAxis
= shak_TwoThousandTwentyFifteenIncentiveAwardPlanMember
 
Stock options exercisable 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
/ us-gaap_PlanNameAxis
= shak_TwoThousandTwentyFifteenIncentiveAwardPlanMember
      0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
/ us-gaap_PlanNameAxis
= shak_TwoThousandTwentyFifteenIncentiveAwardPlanMember
   
Unrecognized compensation expense (USD) $ 21,364us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions
/ us-gaap_PlanNameAxis
= shak_TwoThousandTwentyFifteenIncentiveAwardPlanMember
      21,364us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions
/ us-gaap_PlanNameAxis
= shak_TwoThousandTwentyFifteenIncentiveAwardPlanMember
   
2015 Incentive Award Plan | Stock options              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of shares available for grant             5,865,522us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= shak_TwoThousandTwentyFifteenIncentiveAwardPlanMember
Weighted-average period for recognition compensation expense 4 years 10 months            
2015 Incentive Award Plan | Minimum | Stock options              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Award vesting period 1 year            
2015 Incentive Award Plan | Maximum | Stock options              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Award vesting period 5 years