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Net Earnings Per Share (Schedule Of Computation Of Basic And Diluted Net Earnings Per Share)(Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Feb. 28, 2014
Feb. 28, 2013
Feb. 28, 2014
Feb. 28, 2013
Net Earnings Per Share [Abstract]        
Net earnings $ 13,450 $ 19,351 $ 23,684 $ 34,079
Weighted average shares outstanding 12,910 12,842 12,899 12,799
Diluted effect of stock equivalents 32 40 48 68
Weighted average shares outstanding assuming dilution 12,942 12,882 12,947 12,867
Basic net earnings per share $ 1.04 $ 1.51 $ 1.84 $ 2.66
Diluted net earnings per share $ 1.04 $ 1.50 $ 1.83 $ 2.65