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Derivative Financial Instruments and Hedging Activities Pretax Gains losses reclassified from OCI (Details) - USD ($)
$ in Thousands
3 Months Ended
Nov. 30, 2016
Nov. 30, 2015
Interest, net    
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]    
Interest rate derivatives $ (440) $ (191)