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Income Taxes (Schedule Of Earnings Before Income Taxes) (Details) (USD $)
In Thousands, 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
Income Taxes [Abstract]                      
United States                 $ 70,066 $ 99,781 $ 57,884
Foreign                 8,589 7,526 7,224
Total $ 16,549 $ 25,500 $ 20,789 $ 15,817 $ 15,686 $ 39,750 $ 29,488 $ 22,383 $ 78,655 $ 107,307 $ 65,108