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Asset Write Down (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Feb. 29, 2020 | May 31, 2020 | May 31, 2019 | May 31, 2018
Asset Impairment Charges [Abstract] |  |  |  |
Asset impairments and write downs | $ 40.0 | $ 40.6 | $ 0.9 | $ 11.2
Inventory, net of reserves | 37.6 |  |  |
Author advances | 1.6 |  |  |
Prepublication costs | $ 0.8 |  |  |
Class A Stock [Member] |  |  |  |
Class of Stock [Line Items] |  |  |  |
Impact on earnings per share (USD per share) |  | $ 0.84 |  |

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