Consolidated Statements of Comprehensive Income Parenthetical - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Feb. 29, 2016	Feb. 28, 2015	Feb. 29, 2016	Feb. 28, 2015
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Tax expense (benefit)	$ 2,028	$ 2,042	$ 3,789	$ 4,366
Other Comprehensive Income (Loss), Available-for-sale Securities, Tax expense (benefit)	(805)	88	(441)	476
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax expense (benefit)	$ (1,354)	$ (1,336)	$ (4,050)	$ (1,485)