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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 12 Months Ended
Aug. 31, 2014
May 31, 2014
Feb. 28, 2014
Nov. 30, 2013
Aug. 31, 2013
May 31, 2013
Feb. 28, 2013
Nov. 30, 2012
Aug. 31, 2014
Aug. 31, 2013
Aug. 31, 2012
Net Earnings Per Share [Abstract]                      
Net earnings $ 11,329 $ 16,499 $ 13,450 $ 10,234 $ 10,428 $ 26,063 $ 19,351 $ 14,728 $ 51,512 $ 70,570 $ 43,277
Weighted average shares outstanding                 12,832 12,830 12,704
Diluted effect of stock equivalents                 50 71 106
Weighted average shares outstanding assuming dilution                 12,882 12,901 12,810
Basic net earnings per share                 $ 4.01 $ 5.50 $ 3.41
Diluted net earnings per share $ 0.89 $ 1.28 $ 1.04 $ 0.79 $ 0.81 $ 2.01 $ 1.50 $ 1.15 $ 4.00 $ 5.47 $ 3.38