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Derivative financial instruments (Detail) (USD $)
12 Months Ended
Jan. 30, 2015
Jan. 31, 2014
Feb. 01, 2013
Apr. 11, 2013
Cash flow hedges of interest rate risk        
Loss related to effective portion of derivatives recognized in OCI $ 876,000us-gaap_UnrealizedGainLossOnInterestRateCashFlowHedgesPretaxAccumulatedOtherComprehensiveIncomeLoss $ 16,036,000us-gaap_UnrealizedGainLossOnInterestRateCashFlowHedgesPretaxAccumulatedOtherComprehensiveIncomeLoss $ 9,626,000us-gaap_UnrealizedGainLossOnInterestRateCashFlowHedgesPretaxAccumulatedOtherComprehensiveIncomeLoss  
Gain related to ineffective portion of derivative recognized in Other (income) expense     (2,392,000)us-gaap_GainLossOnInterestRateCashFlowHedgeIneffectiveness  
Estimated amount to be reclassified during the next 52 week period 2,500,000us-gaap_InterestRateCashFlowHedgeGainLossToBeReclassifiedDuringNext12MonthsNet      
Interest rate swaps | Cash flow hedge        
Cash flow hedges of interest rate risk        
Combined notional value 875,000,000us-gaap_DerivativeLiabilityNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
     
Treasury locks | Cash flow hedge        
Cash flow hedges of interest rate risk        
Combined notional value       700,000,000us-gaap_DerivativeLiabilityNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_TreasuryLockMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
Loss related to effective portion of derivatives recognized in OCI   13,200,000us-gaap_UnrealizedGainLossOnInterestRateCashFlowHedgesPretaxAccumulatedOtherComprehensiveIncomeLoss
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_TreasuryLockMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
   
Gain related to ineffective portion of derivative recognized in Other (income) expense   $ 0us-gaap_GainLossOnInterestRateCashFlowHedgeIneffectiveness
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_TreasuryLockMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember