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Investments (Details) - USD ($)	12 Months Ended
	May 31, 2021	May 31, 2020	May 31, 2019
Investments (Details) [Line Items]
Investments	$ 40,300,000	$ 31,000,000.0
Income from equity investments	7,400,000	3,200,000	$ 5,900,000
Proceeds from Dividends Received	$ 2,400,000	1,000,000.0
Children's Book Publishing & Distribution
Investments (Details) [Line Items]
Non-controlling interest held	26.20%
Financing and Production Company
Investments (Details) [Line Items]
Impairment of investments	$ 0
Other Investments
Investments (Details) [Line Items]
Investments	$ 100,000	100,000
Financing and Production Company | Financing and Production Company
Investments (Details) [Line Items]
Percent ownership in financing and production company	4.60%
International
Investments (Details) [Line Items]
Equity method investments	$ 34,300,000	25,000,000.0
Children's Book Publishing & Distribution | Other Cost Method Investments
Investments (Details) [Line Items]
Investments	$ 6,000,000.0	$ 6,000,000.0

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