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Stock Repurchase Program (Details) (USD $)
In Millions, unless otherwise specified
 0 Months Ended 3 Months Ended
Oct. 13, 2011
Nov. 30, 2011
Stock Repurchase Program [Abstract]    
Shares repurchase authorized amount, maximum $ 30.0  
Shares acquired through stock repurchase program   1.5
Total cost for shares acquired through stock repurchase program   10.5
Remaining amount authorized for repurchase of shares   $ 19.5