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Derivative Financial Instruments and Hedging Activities Pretax Gains losses reclassified from OCI (Details) (Interest, net, USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Feb. 28, 2015
Feb. 28, 2014
Feb. 28, 2015
Feb. 28, 2014
Interest, net
       
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]        
Interest rate derivatives $ (199)us-gaap_InterestRateCashFlowHedgeGainLossReclassifiedToEarningsNet
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_InterestExpenseMember
$ 13,360us-gaap_InterestRateCashFlowHedgeGainLossReclassifiedToEarningsNet
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_InterestExpenseMember
$ (402)us-gaap_InterestRateCashFlowHedgeGainLossReclassifiedToEarningsNet
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_InterestExpenseMember
$ 13,143us-gaap_InterestRateCashFlowHedgeGainLossReclassifiedToEarningsNet
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_InterestExpenseMember