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Financial Instruments (Details) (USD $)
In Thousands, unless otherwise specified
Feb. 28, 2015
Mar. 01, 2014
Carrying Amount    
Financial instruments    
Variable rate indebtedness $ 2,695,000us-gaap_LongtermDebtPercentageBearingVariableInterestAmount
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember		 $ 2,522,293us-gaap_LongtermDebtPercentageBearingVariableInterestAmount
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
Fixed rate indebtedness 2,857,950us-gaap_LongtermDebtPercentageBearingFixedInterestAmount
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember		 3,127,439us-gaap_LongtermDebtPercentageBearingFixedInterestAmount
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
Fair Value    
Financial instruments    
Variable rate indebtedness 2,649,825us-gaap_LongtermDebtPercentageBearingVariableInterestAmount
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember		 2,524,508us-gaap_LongtermDebtPercentageBearingVariableInterestAmount
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
Fixed rate indebtedness $ 3,230,801us-gaap_LongtermDebtPercentageBearingFixedInterestAmount
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember		 $ 3,569,777us-gaap_LongtermDebtPercentageBearingFixedInterestAmount
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember