Note 15 - Income Taxes (Details) (USD $)	12 Months Ended
	Aug. 31, 2013		Aug. 31, 2012	Aug. 31, 2011		Aug. 31, 2010
Note 15 - Income Taxes (Details) [Line Items]
Unrecognized Tax Benefits, Decrease Resulting from Current Period Tax Positions	$ 7,200,000			$ 6,300,000
Effective Income Tax Rate Reconciliation, Percent	26.70%	[1]	31.30%	28.40%	[2]
Unrecognized Tax Benefits	5,435,000		5,464,000	7,204,000		7,346,000
Unrecognized Tax Benefits, Interest on Income Taxes Accrued	$ 1,000,000
Before Discrete Items [Member]
Note 15 - Income Taxes (Details) [Line Items]
Effective Income Tax Rate Reconciliation, Percent	28.90%			30.90%

[1] Includes income tax benefits of $7.2 million primarily from the reenactment of the U.S. Federal R&D tax credit in January 2013 and the finalization of the fiscal 2012 tax return. The reenactment of the credit was retroactive to January 1, 2012 and extends through the end of the 2013 calendar year. The fiscal 2013 annual effective tax rate before discrete items of $7.2 million was 28.9%.

[2] Includes income tax benefits of $6.3 million from the finalization of the fiscal 2010 tax return and the reenactment of the U.S. Federal R&D tax credit in December 2010. The fiscal 2011 annual effective tax rate before discrete items of $6.3 million was 30.9%.