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Note 15 - Income Taxes (Details) - Percentage of Income Before Income Taxes
12 Months Ended
Aug. 31, 2013
Aug. 31, 2012
Aug. 31, 2011
Percentage of Income Before Income Taxes [Abstract]      
Tax at federal U.S. statutory tax rate 35.00% 35.00% 35.00%
Increase (decrease) in taxes resulting from:      
State and local taxes, net of U.S. federal income tax benefit 2.00% 2.10% 2.20%
Foreign income at other than U.S. rates (2.50%) (1.90%) (1.70%)
Domestic production activities (Section 199) deduction (2.60%) (2.60%) (2.10%)
Income tax benefit from R&D tax credits (4.10%) (0.80%) (4.90%)
Income tax benefits from foreign tax credits (1.20%) (0.50%) (0.70%)
Other, net 0.10% 0.00% 0.60%
Effective tax rate 26.70% [1] 31.30% 28.40% [2]
[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%.