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Income Taxes (Details 2)
 12 Months Ended
Jan. 31, 2015
Feb. 01, 2014
Feb. 02, 2013
Reconciliation of actual tax rate to federal statutory rate      
Tax expense at U.S. statutory rate (as a percent) 34.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 34.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 34.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
State income taxes, net of federal income tax benefit (as a percent) 1.10%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes 1.80%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes 2.40%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
Adjustments to unrecognized tax benefits (as a percent) (2.80%)chke_EffectiveIncomeTaxRateReconciliationReleaseOfUnrecognizedTaxBenefitsPercent    
Nondeductible expenses (as a percent) 0.10%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpense 0.10%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpense 0.40%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpense
Other (as a percent)     0.30%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments
Tax provision (as a percent) 32.40%us-gaap_EffectiveIncomeTaxRateContinuingOperations 35.90%us-gaap_EffectiveIncomeTaxRateContinuingOperations 37.10%us-gaap_EffectiveIncomeTaxRateContinuingOperations