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Investments (Details) - USD ($)
$ in Millions
12 Months Ended
May 31, 2017
May 31, 2016
May 31, 2015
Investments (Details) [Line Items]      
Investments $ 28.6 $ 26.2  
Income (loss) from equity method investments 5.3 3.5 $ 2.0
Make Believe Ideas Limited (MBI) [Member]      
Investments (Details) [Line Items]      
Equity method investments $ 8.6 8.0  
Non-controlling interest held 48.50%    
Children's Book Publishing and Distribution [Member]      
Investments (Details) [Line Items]      
Equity method investments $ 20.0 18.1  
Non-controlling interest held 26.20%    
Other Investments [Member]      
Investments (Details) [Line Items]      
Investments $ 0.1 0.1  
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