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
	Nov. 30, 2015	Nov. 30, 2014
Derivative Instruments, Gain (Loss) [Line Items]
Interest rate derivatives	$ (6,818)	$ (594)