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Earnings Per Share (Calculation Of Basic And Diluted Earnings Per Share) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended
Feb. 29, 2012
Feb. 28, 2011
Earnings Per Share [Abstract]    
Net income $ 7,489 $ 20,521
Weighted average shares outstanding 62,145 66,986
Dilutive impact from common stock equivalents 985 2,673
Diluted weighted average shares outstanding 63,130 69,659
Basic earnings per share $ 0.12 $ 0.31
Diluted earnings per share $ 0.12 $ 0.29