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Revenues - Disaggregation of Revenue Data (Details) - USD ($) $ in Millions | 12 Months Ended
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May 31, 2022 | May 31, 2021 | May 31, 2020
Disaggregation of Revenue [Line Items] |  |  |
Revenues | $ 1,642.9 | $ 1,300.3 | $ 1,487.1
Revenue Benchmark | Customer Concentration Risk |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Customer with over 10% of revenues |  | 152.7 |
Revenue Benchmark | Customer Concentration Risk | Customer 1 |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Percentage of total revenues |  | 12.00% |
Childrens Book Publishing And Distribution |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 946.5 | $ 675.0 | 881.7
Childrens Book Publishing And Distribution | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 946.5 | 675.0 | 881.7
Childrens Book Publishing And Distribution | Trade |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 344.0 | 328.8 | 306.7
Childrens Book Publishing And Distribution | Trade - International |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 46.4 | 36.5 | 33.8
Childrens Book Publishing And Distribution | Book Clubs |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 126.4 | 145.4 | 157.4
Childrens Book Publishing And Distribution | Book Fairs |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 429.7 | $ 164.3 | 383.8
Childrens Book Publishing And Distribution | Revenue Benchmark | Customer Concentration Risk |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Customer with over 10% of revenues |  | 119.7 |
Education |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 393.6 | $ 312.3 | 287.3
Education | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 393.6 | $ 312.3 | 287.3
Education | Revenue Benchmark | Customer Concentration Risk |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Customer with over 10% of revenues |  | 8.8 |
International Segment |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 302.8 | $ 313.0 | 318.1
International Segment | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 302.8 | 313.0 | 318.1
International Segment | Major Markets |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 237.1 | 226.8 | 227.1
International Segment | Other Markets |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | $ 65.7 | $ 86.2 | $ 91.0
International Segment | Revenue Benchmark | Customer Concentration Risk |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Customer with over 10% of revenues |  | 24.2 |

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