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Stock Compensation Plans and Capital Stock Transactions - Employee Stock Purchase Plan (Narrative) (Details) (Employee Stock [Member], USD $)
In Millions, except Share data, unless otherwise specified
 12 Months Ended
Jan. 31, 2015
offering_period
Feb. 01, 2014
Feb. 02, 2013
Employee Stock [Member]
      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of offering periods under the ESPP 2chs_EmployeeStockPurchasePlanNumberofOfferingPeriods
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockMember		    
Percentage of the value of stock immediately prior to the beginning of each offering period 85.00%chs_ShareBasedCompensationArrangementByShareBasedPaymentAwardPurchasePriceOfCommonStockPercent
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockMember		    
Shares purchased under the ESPP 180,000us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockMember		 187,000us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockMember		 132,000us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockMember
Cash received from purchases under ESPP $ 2.5us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockMember