Note 15. Income Taxes (Detail) - Provision for Income Taxes by Geographic Operations (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Nov. 30, 2011	Nov. 30, 2010
U.S. operations	$ 57,088	$ 50,177
Non-U.S. operations	9,942	9,377
Income before income taxes	67,030	59,554
U.S. operations	19,363	15,678
Non-U.S. operations	2,123	2,275
Total provision for income taxes	$ 21,486	$ 17,953
Effective tax rate	32.10%	30.10%