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Capitalization (Details 4) (USD $)
1 Months Ended 12 Months Ended
Aug. 30, 2014
item
Jan. 31, 2015
Feb. 01, 2014
Feb. 02, 2013
Feb. 01, 2013
Stock-Based Compensation          
Closing share price (in dollars per share)         $ 13.95us-gaap_SharePrice
Performance-Based Equity Awards          
Stock-Based Compensation          
Target growth rate (as a percent)   10.00%chke_ShareBasedCompensationArrangementByShareBasedPaymentAwardTargetGrowthRate
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
     
Target share price for fiscal year 2014 (in dollars per share)   $ 15.35chke_ShareBasedCompensationArrangementByShareBasedPaymentAwardTargetSharePriceAtEndOfGrantYear
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
     
Target share price for fiscal year 2015 (in dollars per share)   $ 16.88chke_ShareBasedCompensationArrangementByShareBasedPaymentAwardTargetSharePriceAtEndOfFirstFullFiscalYearFollowingYearOfGrant
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
     
Target share price for fiscal year ending in 2016 (in dollars per share)   $ 18.57chke_ShareBasedCompensationArrangementByShareBasedPaymentAwardTargetSharePriceAtEndOfSecondFullFiscalYearFollowingYearOfGrant
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
     
Award vesting percentage   33.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
     
Percentage vested during the period   67.00%chke_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
     
Number of increments in which award will vest 5chke_ShareBasedCompensationVestingIncrements
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
       
Restricted Stock and Performance Stock Units          
Stock-Based Compensation          
Compensation expense (in dollars)   $ 400,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= chke_RestrictedStockAndPerformanceStockUnitsMember
$ 200,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= chke_RestrictedStockAndPerformanceStockUnitsMember
$ 10,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= chke_RestrictedStockAndPerformanceStockUnitsMember
 
Number of Shares          
Unvested stock at the beginning of the period (in shares)   87,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= chke_RestrictedStockAndPerformanceStockUnitsMember
7,500us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= chke_RestrictedStockAndPerformanceStockUnitsMember
   
Granted (in shares)   51,576us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= chke_RestrictedStockAndPerformanceStockUnitsMember
79,500us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= chke_RestrictedStockAndPerformanceStockUnitsMember
9,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= chke_RestrictedStockAndPerformanceStockUnitsMember
 
Vested (in shares)   (44,640)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= chke_RestrictedStockAndPerformanceStockUnitsMember
     
Forfeited (in shares)   (17,000)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
/ us-gaap_AwardTypeAxis
= chke_RestrictedStockAndPerformanceStockUnitsMember
  (1,500)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
/ us-gaap_AwardTypeAxis
= chke_RestrictedStockAndPerformanceStockUnitsMember
 
Unvested stock at the end of the period (in shares)   76,936us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= chke_RestrictedStockAndPerformanceStockUnitsMember
87,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= chke_RestrictedStockAndPerformanceStockUnitsMember
7,500us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= chke_RestrictedStockAndPerformanceStockUnitsMember
 
Weighted Average Grant-Date Fair Value          
Unvested stock at the beginning of the period (in dollars per share)   $ 5.70us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= chke_RestrictedStockAndPerformanceStockUnitsMember
$ 13.27us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= chke_RestrictedStockAndPerformanceStockUnitsMember
   
Granted (in dollars per share)   $ 17.22us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= chke_RestrictedStockAndPerformanceStockUnitsMember
$ 4.99us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= chke_RestrictedStockAndPerformanceStockUnitsMember
$ 13.24us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= chke_RestrictedStockAndPerformanceStockUnitsMember
 
Vested (in dollars per share)   $ 5.55us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= chke_RestrictedStockAndPerformanceStockUnitsMember
     
Forfeited (in dollars per share)   $ 7.92us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= chke_RestrictedStockAndPerformanceStockUnitsMember
  $ 13.06us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= chke_RestrictedStockAndPerformanceStockUnitsMember
 
Unvested stock at the end of the period (in dollars per share)   $ 13.02us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= chke_RestrictedStockAndPerformanceStockUnitsMember
$ 5.70us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= chke_RestrictedStockAndPerformanceStockUnitsMember
$ 13.27us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= chke_RestrictedStockAndPerformanceStockUnitsMember
 
Unrecognized stock-based compensation          
Unrecognized stock-based compensation expense (in dollars)   $ 600,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= chke_RestrictedStockAndPerformanceStockUnitsMember
     
Weighted average period for recognition of unrecognized stock-based compensation expense   1 year 8 months 9 days      
Restricted Stock Units | Non-employee Director          
Stock-Based Compensation          
Maximum percentage of compensation to be paid in equity   100.00%chke_ShareBasedCompensationPercentageOfCompensationPaidInEquity
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_TitleOfIndividualAxis
= chke_DirectorNonEmployeeMember
     
Vesting period   1 year