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Investments (Details) - USD ($)
1 Months Ended 3 Months Ended
Apr. 30, 2019
Aug. 31, 2020
Aug. 31, 2019
May 31, 2020
Investments (Details) [Line Items]        
Investments   $ 33,900,000 $ 28,500,000 $ 31,000,000.0
Income from equity method investments   800,000 1,000,000.0  
Equity method investment, impairment   $ 0    
Children's Book Publishing and Distribution        
Investments (Details) [Line Items]        
Equity method ownership percentage   26.20%    
Financing and Production Company | Financing and Production Company        
Investments (Details) [Line Items]        
Other equity percentage 4.60%      
International        
Investments (Details) [Line Items]        
Equity method investment   $ 27,900,000 22,500,000 25,000,000.0
Children's Book Publishing and Distribution | Other Investments        
Investments (Details) [Line Items]        
Investments   $ 6,000,000.0 $ 6,000,000.0 $ 6,000,000.0