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Investments (Details) - USD ($)	1 Months Ended	12 Months Ended
	Apr. 30, 2019	May 31, 2019	May 31, 2018	May 31, 2017
Investments (Details) [Line Items]
Investments		$ 29,400,000	$ 31,100,000
Income (loss) from equity method investments		5,900,000	4,800,000	$ 5,300,000
Children's Book Publishing and Distribution [Member]
Investments (Details) [Line Items]
Equity method investments		$ 23,400,000	20,500,000
Non-controlling interest held		26.20%
Financing and Production Company [Member]
Investments (Details) [Line Items]
Equity investment acquired	$ 6,000,000
Impairment of investments		$ 0
Other Investments [Member]
Investments (Details) [Line Items]
Investments		$ 100,000	100,000
Make Believe Ideas Limited (MBI) [Member]
Investments (Details) [Line Items]
Equity method investments			$ 10,600,000
Non-controlling interest held		0.00%	48.50%
Financing and Production Company [Member] | Financing and Production Company [Member]
Investments (Details) [Line Items]
Limited Liability Company or Limited Partnership, Members or Limited Partners, Ownership Interest	4.60%

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