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Goodwill and Other Intangibles (Details) - USD ($)
$ in Millions
12 Months Ended
May. 31, 2015
May. 31, 2014
May. 31, 2013
Nov. 30, 2013
Goodwill and Other Intangibles (Details) [Line Items]        
Goodwill impairment $ 5.4 $ 13.4    
Goodwill, net carrying value 116.3 121.8 $ 135.2  
Amortization expense $ 1.9 2.0 $ 2.1  
Useful life of intangible assets 4 years      
Children's Book Publishing and Distribution [Member]        
Goodwill and Other Intangibles (Details) [Line Items]        
Goodwill impairment   $ 13.4    
Difference between fair value and carrying value       $ 13.0
Goodwill, net carrying value       $ 66.9
Discount rate 15.50%      
Perpetual growth rate 3.00%