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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, 2013
May 31, 2012
May 31, 2013
May 31, 2012
Net Earnings Per Share [Abstract]        
Net earnings $ 26,063 $ 18,823 $ 60,142 $ 34,518
Weighted average shares outstanding 12,858 12,714 12,819 12,700
Diluted effect of stock equivalents 89 100 75 99
Weighted average shares outstanding assuming dilution 12,947 12,814 12,894 12,799
Basic net earnings per share $ 2.03 $ 1.48 $ 4.69 $ 2.72
Diluted net earnings per share $ 2.01 $ 1.47 $ 4.66 $ 2.70