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Derivative Financial Instruments and Hedging Activities Gains (Losses) Included in Other Comprehensive Income on Derivatives Accounted for as Hedging Instruments, Net of Tax (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
May 31, 2017
May 31, 2016
May 31, 2017
May 31, 2016
Derivative Instruments, Gain (Loss) [Line Items]        
Interest rate derivatives $ 0 $ 0 $ 0 $ (10,070)