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Share Repurchases (Details) (USD $)
Share data in Millions, except Per Share data, unless otherwise specified
1 Months Ended
Mar. 31, 2015
May 02, 2015
Jan. 31, 2015
Dec. 31, 2013
Equity, Class of Treasury Stock [Line Items]        
Share repurchase authorization       $ 300,000,000us-gaap_StockRepurchaseProgramAuthorizedAmount1
Amount remaining under stock repurchase program   40,000,000us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1 290,000,000us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1  
Initial delivery, percentage of total shares 75.00%chs_AcceleratedShareRepurchaseProgramPercentofTotalShares      
Value of initial shares 187,500,000chs_AcceleratedStockRepurchaseProgramInitialSharesReceivedValue      
Price per share (in dollars per share) $ 17.50us-gaap_AcceleratedShareRepurchasesInitialPricePaidPerShare      
Forward Contract Indexed to Issuer's Equity, Settlement Alternatives, Cash, at Fair Value 62,500,000us-gaap_ForwardContractIndexedToIssuersEquitySettlementAlternativesCashAtFairValue      
Accelerated Stock Repurchase Agreement [Member]        
Equity, Class of Treasury Stock [Line Items]        
Share repurchase authorization 250,000,000us-gaap_StockRepurchaseProgramAuthorizedAmount1
/ us-gaap_ShareRepurchaseProgramAxis
= chs_AcceleratedStockRepurchaseAgreementMember
     
Number of shares of treasury stock 10.70us-gaap_TreasuryStockSharesAcquired
/ us-gaap_ShareRepurchaseProgramAxis
= chs_AcceleratedStockRepurchaseAgreementMember
     
Merrill Lynch [Member]        
Equity, Class of Treasury Stock [Line Items]        
Payment for accelerated stock repurchase agreements 125,000,000us-gaap_AcceleratedShareRepurchasesSettlementPaymentOrReceipt
/ us-gaap_CounterpartyNameAxis
= chs_MerrillLynchInternationalMember
     
Merrill Lynch [Member] | Accelerated Stock Repurchase Agreement [Member]        
Equity, Class of Treasury Stock [Line Items]        
Number of shares of treasury stock 5.35us-gaap_TreasuryStockSharesAcquired
/ us-gaap_CounterpartyNameAxis
= chs_MerrillLynchInternationalMember
/ us-gaap_ShareRepurchaseProgramAxis
= chs_AcceleratedStockRepurchaseAgreementMember
     
JP Morgan [Member]        
Equity, Class of Treasury Stock [Line Items]        
Payment for accelerated stock repurchase agreements $ 125,000,000us-gaap_AcceleratedShareRepurchasesSettlementPaymentOrReceipt
/ us-gaap_CounterpartyNameAxis
= chs_J.P.MorganSecuritiesLLCMember
     
JP Morgan [Member] | Accelerated Stock Repurchase Agreement [Member]        
Equity, Class of Treasury Stock [Line Items]        
Number of shares of treasury stock 5.35us-gaap_TreasuryStockSharesAcquired
/ us-gaap_CounterpartyNameAxis
= chs_J.P.MorganSecuritiesLLCMember
/ us-gaap_ShareRepurchaseProgramAxis
= chs_AcceleratedStockRepurchaseAgreementMember