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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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