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Net Earnings Per Share (Schedule Of Computation Of Basic And Diluted Net Earnings Per Share) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Aug. 31, 2015
 [1]
May. 31, 2015
Feb. 28, 2015
Nov. 30, 2014
Aug. 31, 2014
 [1]
May. 31, 2014
Feb. 28, 2014
Nov. 30, 2013
Aug. 31, 2015
Aug. 31, 2014
Aug. 31, 2013
Net Earnings Per Share [Abstract]                      
Net earnings $ (3,181) $ 12,927 $ 8,995 $ 7,568 $ 11,329 $ 16,499 $ 13,450 $ 10,234 $ 26,309 $ 51,512 $ 70,570
Weighted average shares outstanding                 11,818 12,832 12,830
Diluted effect of stock equivalents                 37 50 71
Weighted average shares outstanding assuming dilution                 11,855 12,882 12,901
Basic net earnings per share                 $ 2.23 $ 4.01 $ 5.50
Diluted net earnings per share $ (0.28) $ 1.10 $ 0.75 $ 0.62 $ 0.89 $ 1.28 $ 1.04 $ 0.79 $ 2.22 $ 4.00 $ 5.47
[1] The fourth quarter 2015 results were impacted by a bad debt reserve of $5.0 million on accounts receivable and a reserve of $2.9 million against foreign income tax assets.