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Investments (Details) - USD ($)
$ in Millions
12 Months Ended
May 31, 2016
May 31, 2015
May 31, 2014
Mar. 19, 2015
Investments (Details) [Line Items]        
Investments $ 26.2 $ 26.3    
Income (loss) from equity method investments 3.5 2.0 $ 2.6  
Make Believe Ideas Limited (MBI) [Member]        
Investments (Details) [Line Items]        
Equity interest acquired (percent)       48.50%
Equity method investments 8.0 7.3    
Children's Book Publishing and Distribution [Member]        
Investments (Details) [Line Items]        
Equity method investments $ 18.1 17.9    
Non-controlling interest held 26.20%      
Dividends received $ 1.1      
Other Investments [Member]        
Investments (Details) [Line Items]        
Investments 0.1 1.1    
Cost Method Investment in China [Member]        
Investments (Details) [Line Items]        
Gain on sale of cost method investments $ 2.2      
UK Based Cost Method Investment [Member]        
Investments (Details) [Line Items]        
Gain on sale of cost method investments   $ 0.6    
UK and US Based Cost Method Investments [Member]        
Investments (Details) [Line Items]        
Unrealized loss on investments     $ 5.8