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Investments (Details) - USD ($)		12 Months Ended
	Mar. 19, 2015	May. 31, 2015	May. 31, 2014	May. 31, 2013
Investments (Details) [Line Items]
Investments		$ 26,300,000	$ 18,400,000
Income (loss) from equity method investments		2,000,000	2,600,000	$ 2,300,000
Gain (loss) on investments				$ 0
Make Believe Ideas Limited (MBI) [Member]
Investments (Details) [Line Items]
Equity interest acquired	48.50%
Period before purchase of remaining outstanding shares	4 years
Equity method investments		7,300,000
Children's Book Publishing and Distribution [Member]
Investments (Details) [Line Items]
Equity method investments		$ 17,900,000	18,300,000
Non-controlling interest held		26.20%
Dividends received		$ 1,000,000
Other Investments [Member]
Investments (Details) [Line Items]
Investments		1,100,000	100,000
UK-based [Member]
Investments (Details) [Line Items]
Gain on sale of cost method investments		$ 600,000
Unrealized loss on investments			$ 5,800,000

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