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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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