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Acquisition (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Dec. 27, 2011
Acquisition [Abstract]    
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