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Income Taxes (Schedule Of Effective income Tax Rate Reconciliation) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Aug. 31, 2016 | Aug. 31, 2015 | Aug. 31, 2014
Income Taxes [Abstract] |  |  |
U.S statutory rate | $ 10,251 | $ 16,363 | $ 27,529
State and local taxes, net of federal tax benefit | 350 | 911 | 1,067
Foreign tax rate differences | (377) | 1,311 | (116)
Domestic production activities deduction | (960) | (1,548) | (2,170)
Deferred tax asset valuation allowance |  | 2,949 |
Other | (243) | 456 | 833
Total income tax provision | $ 9,021 | $ 20,442 | $ 27,143
U.S statutory rate, percentage | 35.00% | 35.00% | 35.00%
State and local taxes, net of federal tax benefit, percentage | 1.20% | 1.90% | 1.40%
Foreign tax rate differences, percentage | (1.30%) | 2.80% | (0.10%)
Domestic production activities deduction, percentage | (3.30%) | (3.30%) | (2.80%)
Deferred tax asset valuation allowance, percentage |  | 6.30% |
Other, percentage | (0.80%) | 1.00% | 1.00%
Effective rate, percentage | 30.80% | 43.70% | 34.50%

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