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Investments (Details) - USD ($)
$ in Millions
3 Months Ended
Aug. 31, 2017
Aug. 31, 2016
May 31, 2017
Mar. 19, 2015
Investments (Details) [Line Items]        
Investments $ 28.7 $ 25.5 $ 28.6  
Income from equity method investments 1.2 1.8    
Make Believe Ideas Limited (MBI)        
Investments (Details) [Line Items]        
Percentage of interests acquired       48.50%
Equity method investment 9.3 7.8 8.6  
Children's Book Publishing and Distribution        
Investments (Details) [Line Items]        
Equity method investment $ 19.4 17.7 20.0  
Equity method ownership percentage 26.20%      
Other Investments        
Investments (Details) [Line Items]        
Investments $ 0.1 $ 0.1 $ 0.1