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Net Earnings Per Share (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Aug. 31, 2013
May 31, 2013
Feb. 28, 2013
Nov. 30, 2012
Aug. 31, 2012
May 31, 2012
Feb. 29, 2012
Nov. 30, 2011
Aug. 31, 2013
Aug. 31, 2012
Aug. 31, 2011
Net Earnings Per Share [Abstract]                      
Net earnings $ 10,428 $ 26,063 $ 19,351 $ 14,728 $ 8,759 $ 18,823 $ 12,774 $ 2,921 $ 70,570 $ 43,277 $ 36,802
Weighted average shares outstanding                 12,830 12,704 12,560
Diluted effect of stock equivalents                 71 106 132
Weighted average shares outstanding assuming dilution                 12,901 12,810 12,692
Basic net earnings per share                 $ 5.50 $ 3.41 $ 2.93
Diluted net earnings per share $ 0.81 $ 2.01 $ 1.50 $ 1.15 $ 0.68 $ 1.47 $ 1.00 $ 0.23 $ 5.47 $ 3.38 $ 2.90