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Investments (Details) - USD ($)	3 Months Ended		6 Months Ended
	Nov. 30, 2021	Nov. 30, 2020	Nov. 30, 2021	Nov. 30, 2020	May 31, 2021
Investments (Details) [Line Items]
Investments	$ 39,700,000	$ 38,500,000	$ 39,700,000	$ 38,500,000	$ 40,300,000
Income from equity-method investments	$ 500,000	4,600,000	1,600,000	5,400,000
Equity method investment, impairment			$ 0
Children's Book Publishing and Distribution
Investments (Details) [Line Items]
Equity method ownership percentage	26.20%		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	$ 33,700,000	32,500,000	$ 33,700,000	32,500,000	34,300,000
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	$ 6,000,000.0	$ 6,000,000.0

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