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Income Taxes (Schedule Of Earnings Before Income Taxes) (Details) - USD ($)
$ 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
Income Taxes [Abstract]                      
United States                 $ 49,668 $ 70,066 $ 99,781
Foreign                 (2,917) 8,589 7,526
Total $ 529 $ 20,423 $ 14,138 $ 11,661 $ 16,549 $ 25,500 $ 20,789 $ 15,817 $ 46,751 $ 78,655 $ 107,307
[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.