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v3.21.2

Asset Write Down (Details) $ / shares in Units, $ in Millions | 12 Months Ended
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May 31, 2021 USD ($) fairs $ / shares | May 31, 2020 USD ($) $ / shares | May 31, 2019 USD ($)
Class of Stock [Line Items] |  |  |
Asset impairments and write downs | $ 11.1 | $ 40.6 | $ 0.9
Impairment on right-of-use assets | 7.0 |  |
Impairment expense on other long-lived assets | 1.5 |  |
Impairment loss impact | 11.1 |  |
Author advances |  | 1.6 |
Prepublication costs |  | 0.8 |
Asset impairment expense | 2.6 |  |
Provision for losses on inventory | $ 36.6 | 34.3 | $ 20.8
Number of book fair closed | fairs | 13 |  |
Number of book fairs total | fairs | 54 |  |
Inventory Write-down, Net Of Reserves |  | 37.6 |
Inventory Valuation and Obsolescence |  |  |
Class of Stock [Line Items] |  |  |
Asset impairments and write downs |  | $ 40.0 |
Leaseholds and Leasehold Improvements |  |  |
Class of Stock [Line Items] |  |  |
Asset impairments and write downs | $ 8.5 |  |
Class A Stock |  |  |
Class of Stock [Line Items] |  |  |
Impact on earnings per share (USD per share) | $ / shares | $ 0.24 | $ 0.84 |

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