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Goodwill and Other Intangibles (Details) (USD $)
In Millions, unless otherwise specified
9 Months Ended 12 Months Ended 9 Months Ended 3 Months Ended
Feb. 28, 2014
Feb. 28, 2013
May 31, 2013
Feb. 28, 2014
Finite-Lived Intangible Assets
Feb. 28, 2013
Finite-Lived Intangible Assets
Feb. 28, 2014
Children's Book Publishing and Distribution
Goodwill and Other Intangibles (Details) [Line Items]            
Goodwill, Impairment Loss $ 13.4 $ 0 $ 0      
Reporting Unit, Amount of Fair Value in Excess of Carrying Amount           13.0
Reporting Unit, Carrying Value           66.9
Fair Value Inputs, Discount Rate           15.50%
Fair Value Inputs, Long-term Revenue Growth Rate           3.00%
Amortization of Intangible Assets       $ 1.8 $ 1.9  
Finite-Lived Intangible Asset, Useful Life 5 years