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Investments (Details) - USD ($) $ in Millions			3 Months Ended	6 Months Ended		12 Months Ended
	Nov. 05, 2015	Mar. 19, 2015	Nov. 30, 2015	Nov. 30, 2015	Nov. 30, 2014	May. 31, 2015
Investments (Details) [Line Items]
Investments			$ 27.2	$ 27.2	$ 18.9	$ 26.3
Proceeds from the sale of investments	$ 3.3			3.3	0.6
Income from equity method investments				2.4	1.7
Realized gain on cost method investments			2.2
Make Believe Ideas Limited (MBI)
Investments (Details) [Line Items]
Percentage of interests acquired		48.50%
Period before purchase of remaining outstanding shares (in years)		4 years
Equity method investment			8.2	8.2	0.0	7.3
Children's Book Publishing and Distribution
Investments (Details) [Line Items]
Equity method investment			$ 19.0	$ 19.0	18.9	17.9
Equity method ownership percentage			26.20%	26.20%
Other Investments
Investments (Details) [Line Items]
Investments			$ 0.0	$ 0.0	$ 0.0	1.1
UK Equitymethod
Investments (Details) [Line Items]
Realized gain on cost method investments						$ 0.6

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