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Investments (Details) - USD ($) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Apr. 30, 2019 | May 31, 2020 | May 31, 2019 | May 31, 2018
Investments (Details) [Line Items] |  |  |  |
Investments |  | $ 31,000,000.0 | $ 29,400,000 |
Income (loss) from equity method investments |  | $ 3,200,000 | 5,900,000 | $ 4,800,000
Children's Book Publishing and Distribution [Member] |  |  |  |
Investments (Details) [Line Items] |  |  |  |
Non-controlling interest held |  | 26.20% |  |
Financing and Production Company [Member] |  |  |  |
Investments (Details) [Line Items] |  |  |  |
Equity investment acquired | $ 6,000,000.0 |  |  |
Impairment of investments |  | $ 0 |  |
Other Investments [Member] |  |  |  |
Investments (Details) [Line Items] |  |  |  |
Investments |  | 100,000 | 0 |
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% |  |  |
International |  |  |  |
Investments (Details) [Line Items] |  |  |  |
Equity method investments |  | 25,000,000.0 | 23,400,000 |
Children's Book Publishing and Distribution [Member] | Other Cost Method Investments [Member] |  |  |  |
Investments (Details) [Line Items] |  |  |  |
Investments |  | $ 6,000,000.0 | $ 6,000,000.0 |

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