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Postretirement Health Care and Life Insurance Benefits (Weighted Average Assumptions Used To Determine Projected Benefit Obligations For Postretirement Obligations) (Details) (Other Postretirement Benefit Plan [Member])
Jan. 31, 2015
Feb. 01, 2014
Other Postretirement Benefit Plan [Member]
    
Discount rate 3.55%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate
/ us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsByTypeOfDeferredCompensationAxis
= us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember		 4.50%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate
/ us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsByTypeOfDeferredCompensationAxis
= us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember