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Earnings Per Share and Stock Issuances-Common Stock Activity (Details)
In Millions, unless otherwise specified
3 Months Ended
Feb. 28, 2013
Feb. 29, 2012
Stock Options And Restricted Stock Units [Member]
   
Employee Stock Purchase Plan [Line Items]    
Shares issued under stock option, employee stock purchase plans and RSUs 0.4 0.5
Share Repurchase Program [Member]
   
Employee Stock Purchase Plan [Line Items]    
Stock Repurchased During Period, Shares 0.9 0.8