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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 9 Months Ended
May 31, 2014
May 31, 2013
May 31, 2014
May 31, 2013
Net Earnings Per Share [Abstract]        
Net earnings $ 16,499 $ 26,063 $ 40,183 $ 60,142
Weighted average shares outstanding 12,843 12,858 12,881 12,819
Diluted effect of stock equivalents 46 89 46 75
Weighted average shares outstanding assuming dilution 12,889 12,947 12,927 12,894
Basic net earnings per share $ 1.28 $ 2.03 $ 3.12 $ 4.69
Diluted net earnings per share $ 1.28 $ 2.01 $ 3.11 $ 4.66