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Earnings Per Share and Stock Issuances-Antidilutive Securities not Considered in Earnings Per Share Calculation (Details)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Aug. 31, 2013
Aug. 31, 2012
Aug. 31, 2013
Aug. 31, 2012
Earnings Per Share, Basic and Diluted [Abstract]        
Anti-dilutive securities 0.9 0.2 0.5 0.5