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Segment Information - Schedule of segment reporting information (Details) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Aug. 31, 2021 USD ($) segment | Aug. 31, 2020 USD ($) | May 31, 2021 USD ($) | May 31, 2020 USD ($)
Segment Reporting Information [Line Items] |  |  |  |
Number of reportable segments | segment | 3 |  |  |
Revenues | $ 259.8 | $ 215.2 |  |
Bad debt expense | 1.6 | 1.4 |  |
Segment operating income (loss) | (32.0) | (57.0) |  |
Goodwill | $ 125.9 | 125.6 | $ 126.3 | $ 124.9
Children's Book Publishing and Distribution |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Number of operating segments | segment | 3 |  |  |
Revenues | $ 115.8 | 92.3 |  |
Education |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Number of operating segments | segment | 1 |  |  |
Revenues | $ 80.1 | 53.6 |  |
International |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Number of operating segments | segment | 3 |  |  |
Revenues | $ 63.9 | 69.3 |  |
Operating Segments | Children's Book Publishing and Distribution |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Segment operating income (loss) | (21.7) | (29.0) |  |
Operating Segments | Education |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Segment operating income (loss) | 7.3 | (2.4) |  |
Operating Segments | Overhead |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Segment operating income (loss) | (15.9) | (30.4) |  |
Operating Segments | International |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Segment operating income (loss) | $ (1.7) | $ 4.8 |  |

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