Note 15. Income Taxes (Detail) - Provision for Income Taxes by Geographic Operations (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Feb. 29, 2012	Feb. 28, 2011	Feb. 29, 2012	Feb. 28, 2011
U.S. operations (in Dollars)	$ 57,014	$ 49,394	$ 114,102	$ 99,571
U.S. operations	15.40%		14.60%
Non-U.S. operations (in Dollars)	10,599	8,831	20,541	18,208
Non-U.S. operations	20.00%		12.80%
Income before income taxes (in Dollars)	67,613	58,225	134,643	117,779
Income before income taxes	16.10%		14.30%
U.S. operations (in Dollars)	18,707	10,748	38,070	26,426
U.S. operations	74.10%		44.10%
Non-U.S. operations (in Dollars)	2,160	2,223	4,283	4,498
Non-U.S. operations	(2.80%)		(4.80%)
Total provision for income taxes (in Dollars)	$ 20,867	$ 12,971	$ 42,353	$ 30,924
Total provision for income taxes	60.90%		37.00%
Effective tax rate	30.90%	22.30%	31.50%	26.30%