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Investments (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 19, 2015
Aug. 31, 2015
Aug. 31, 2014
May. 31, 2015
Investments (Details) [Line Items]        
Investments   $ 27.6 $ 18.8 $ 26.3
Income from equity method investments   1.2 0.7  
Make Believe Ideas Limited (MBI)        
Investments (Details) [Line Items]        
Percentage of interests acquired 48.50%      
Period before purchase of remaining outstanding shares 4 years      
Equity method investment   $ 7.8 0.0 7.3
UK Equitymethod        
Investments (Details) [Line Items]        
Equity method ownership percentage   26.20%    
Realized gain on cost method investments       0.6
Children's Book Publishing and Distribution        
Investments (Details) [Line Items]        
Equity method investment   $ 18.7 18.8 17.9
Other Investments        
Investments (Details) [Line Items]        
Investments   $ 1.1 $ 0.0 $ 1.1