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Investments - Narrative (Details) - USD ($) $ in Millions |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Jun. 20, 2024 | Nov. 30, 2024 | Nov. 30, 2023 | Nov. 30, 2024 | Nov. 30, 2023
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |  |
Equity Securities without Readily Determinable Fair Value, Impairment Loss, Cumulative Amount |  | $ 0.0 |  | $ 0.0 |
Income from equity-method investments |  | $ 0.6 | $ 0.1 | $ 0.8 | $ 0.3
9 Story Media Group Inc. |  |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |  |
Equity method and other investments | $ 0.9 |  |  |  |
Total Children's Book Publishing and Distribution |  |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |  |
Equity method ownership percentage |  | 26.20% |  | 26.20% |
Financing and Production Company | Financing and Production Company |  |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |  |
Other equity percentage |  |  |  | 4.60% |
UK Children's Book Publishing |  |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |  |
Other equity investments, percentage acquired | 12.00% |  |  |  |
Animated Television Production Companies |  |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |  |
Equity method ownership percentage | 50.00% |  |  |  |

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