Note 15 - Income Taxes (Details) - Provision for Income Taxes by Geographic Operations (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	May 31, 2014	May 31, 2013	May 31, 2014	May 31, 2013
Provision for Income Taxes by Geographic Operations [Abstract]
U.S. operations	$ 58,943	$ 59,122	$ 181,631	$ 162,101
Non-U.S. operations	14,428	12,876	42,220	37,930
Income before income taxes	73,371	71,998	223,851	200,031
U.S. operations	20,631	15,787	60,560	44,115
Non-U.S. operations	1,208	2,844	7,155	8,242
Total provision for income taxes	$ 21,839	$ 18,631	$ 67,715	$ 52,357
Effective tax rate	29.80%	25.90%	30.30%	26.20%