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Income Taxes (Schedule Of Effective income Tax Rate Reconciliation) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Aug. 31, 2015
Aug. 31, 2014
Aug. 31, 2013
Income Taxes [Abstract]      
U.S statutory rate $ 16,363 $ 27,529 $ 37,558
State and local taxes, net of federal tax benefit 911 1,067 1,365
Foreign tax rate differences 1,311 (116) (103)
Domestic production activities deduction (1,548) (2,170) (2,638)
Research and development and fuel tax credits (71) (89) (289)
Deferred tax asset valuation allowance 2,949    
Other 527 922 844
Total income tax provision $ 20,442 $ 27,143 $ 36,737
U.S statutory rate, percentage 35.00% 35.00% 35.00%
State and local taxes, net of federal tax benefit, percentage 1.90% 1.40% 1.30%
Foreign tax rate differences, percentage 2.80% (0.10%) (0.10%)
Domestic production activities deduction, percentage (3.30%) (2.80%) (2.50%)
Research and development and fuel tax credits, percentage (0.10%) (0.10%) (0.30%)
Deferred tax asset valuation allowance, percentage 6.30%    
Other, percentage 1.10% 1.10% 0.80%
Effective rate, percentage 43.70% 34.50% 34.20%