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Investments - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Feb. 28, 2026
Nov. 30, 2025
Feb. 28, 2025
Feb. 28, 2026
Feb. 28, 2025
Jun. 20, 2024
Debt and Equity Securities, FV-NI [Line Items]            
Equity Securities without readily determinable fair value, impairment loss $ 0.0     $ 0.0    
Income (loss) from equity method investments $ 0.1   $ (0.1) $ 0.4 $ 0.8  
9 Story Media Group Inc.            
Debt and Equity Securities, FV-NI [Line Items]            
Equity method and other investments           $ 0.9
Financing and Production Company | Financing and Production Company            
Debt and Equity Securities, FV-NI [Line Items]            
Other equity percentage       4.60%    
UK Children's Book Publishing            
Debt and Equity Securities, FV-NI [Line Items]            
Equity Securities without readily determinable fair value, impairment loss   $ 0.3        
Other equity investments, percentage acquired   12.00%        
Animated Television Production Companies            
Debt and Equity Securities, FV-NI [Line Items]            
Equity method ownership percentage           50.00%
UK Book Publishing Business            
Debt and Equity Securities, FV-NI [Line Items]            
Equity method ownership percentage 26.20%     26.20%