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Revenues - Disaggregation of Revenue (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Feb. 29, 2020 | Feb. 28, 2019 | Feb. 29, 2020 | Feb. 28, 2019
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | $ 373.3 | $ 360.1 | $ 1,203.1 | $ 1,183.2
Children's Book Publishing and Distribution | U.S. Book Clubs |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 43.4 | 55.0 | 137.3 | 165.4
Children's Book Publishing and Distribution | U.S. Book Fairs |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 100.1 | 97.4 | 351.7 | 343.3
Children's Book Publishing and Distribution | U.S. Trade |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 70.4 | 65.6 | 231.6 | 222.9
Education |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 74.3 |  | 192.5 | 179.7
International | Major Markets |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 59.2 | 54.0 | 210.1 | 192.2
International | Other Markets |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | $ 25.9 | $ 27.8 | $ 79.9 | $ 79.7

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