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Acquisition (Details) (Jack Welch Management Institute [Member], USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 27, 2011
Jack Welch Management Institute [Member]
   
Business Acquisition [Line Items]    
Purchase price   $ 7.0
Cash received   2.8
Deferred payments 2.2  
Acquisition, course content 0.8  
Acquired course content estimated useful life, years 5  
Indefinite-lived intangible assets 1.6  
Goodwill $ 6.8