Consolidated Statements of Comprehensive Income Parenthetical (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Feb. 28, 2013	Feb. 29, 2012	Feb. 28, 2013	Feb. 29, 2012
Other Comprehensive Income (Loss), Reclassification, Pension and Other Postretirement Benefit Plans, Net Gain (Loss) Recognized in Net Periodic Benefit Cost, Tax	$ 27	$ 125	$ 27	$ 125
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Tax (expense) benefit	44	11	64	13
Other Comprehensive Income (Loss), Available-for-sale Securities, Tax expense (benefit)	331	353	338	316
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax expense (benefit)	261	167	352	210
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax expense (benefit)	$ 629	$ (1,206)	$ 663	$ (2,114)