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Derivative Financial Instruments and Hedging Activities Pretax Gains losses reclassified from OCI (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Feb. 29, 2016
Feb. 28, 2015
Feb. 29, 2016
Feb. 28, 2015
Interest, net        
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]        
Interest rate derivatives $ (275) $ (199) $ (465) $ (402)