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Investments - Summary of the Company's Investments (Details) - USD ($)
$ in Millions
Aug. 31, 2023
May 31, 2023
Aug. 31, 2022
Debt and Equity Securities, FV-NI [Line Items]      
Total Investments $ 38.3 $ 37.6 $ 34.7
International      
Debt and Equity Securities, FV-NI [Line Items]      
Equity method investments 32.3 31.6 28.7
Children's Book Publishing & Distribution | Other equity investments      
Debt and Equity Securities, FV-NI [Line Items]      
Total Investments $ 6.0 $ 6.0 $ 6.0