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Income Taxes (Details)
3 Months Ended 6 Months Ended
Feb. 29, 2012
Feb. 28, 2011
Feb. 29, 2012
Feb. 28, 2011
Income Taxes [Abstract]        
Federal statutory rate 35.00% 35.00% 35.00% 35.00%
State taxes, net of credits (3.70%) 1.00% (1.50%) 1.00%
Foreign income taxed at different rates 0.20% (2.10%) (0.60%) (1.70%)
Section 199 deduction (1.20%) (0.60%) (1.40%) (0.90%)
Non-deductible officers’ compensation 0.90% 0.30% 0.80% 0.30%
Noncontrolling interests (2.30%) (0.90%) (2.20%) (1.10%)
Foreign interest income 2.00% 0.00% 1.20% 0.00%
Other 0.60% 0.20% 0.20% 0.20%
Effective tax rate 31.50% 32.90% 31.50% 32.80%