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Basis of Presentation - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Nov. 30, 2021 | Nov. 30, 2020 | Nov. 30, 2021 | Nov. 30, 2020
Long Lived Assets Held-for-sale [Line Items] |  |  |  |
(Gain) loss on sale of assets | $ 6.2 | $ (0.0) | $ 6.2 | $ 6.6
Make Believe Ideas Limited (MBI) | Scholastic, Inc. |  |  |  |
Long Lived Assets Held-for-sale [Line Items] |  |  |  |
Ownership percentage | 95.00% |  | 95.00% |
Make Believe Ideas Limited (MBI) | Founder and CEO of MBI |  |  |  |
Long Lived Assets Held-for-sale [Line Items] |  |  |  |
Ownership percentage by founder and CEO of MBI | 5.00% |  | 5.00% |
Lake Mary |  |  |  |
Long Lived Assets Held-for-sale [Line Items] |  |  |  |
Assets held-for-sale | $ 4.2 |  | $ 4.2 |
Land, Buildings and Improvements |  |  |  |
Long Lived Assets Held-for-sale [Line Items] |  |  |  |
Assets held-for-sale |  | 5.7 |  | $ 5.7
Proceeds from sale | 10.4 | 12.3 |  |
(Gain) loss on sale of assets | 6.2 | $ 6.6 |  |
Witney Facilities |  |  |  |
Long Lived Assets Held-for-sale [Line Items] |  |  |  |
Assets held-for-sale | $ 2.1 |  | $ 2.1 |

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