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Investments - Narrative (Details) - USD ($)	3 Months Ended		9 Months Ended
Investments - Narrative (Details) - USD ($)	Feb. 28, 2023	Feb. 28, 2022	Feb. 28, 2023	Feb. 28, 2022
Debt and Equity Securities, FV-NI [Line Items]
Equity method investment, impairment			$ 0
Income from equity-method investments	$ 200,000	$ 100,000	$ 1,500,000	$ 1,600,000
Children's Book Publishing & Distribution
Debt and Equity Securities, FV-NI [Line Items]
Equity method ownership percentage	26.20%		26.20%
Financing and Production Company \| Financing and Production Company
Debt and Equity Securities, FV-NI [Line Items]
Other equity percentage			4.60%