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Income Taxes (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
May 31, 2012 | May 31, 2011 | May 31, 2012 | May 31, 2011
Income Taxes [Abstract] |  |  |  |
Income tax expense | $ 9,764 | $ 7,870 | $ 17,937 | $ 15,837
Estimated effective income tax rate | 34.20% | 34.00% | 34.20% | 33.90%

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