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Revenues - Disaggregation of Revenue (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Feb. 28, 2019 | Feb. 28, 2018 | Feb. 28, 2019 | Feb. 28, 2018
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues |  | $ 360.1 | $ 344.7 | $ 1,183.2 | $ 1,132.2
Children's Book Publishing and Distribution |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues |  | 218.0 | 201.6 | 731.6 | 684.2
Children's Book Publishing and Distribution | Book Clubs |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues |  | 55.0 | 57.7 | 165.4 | 165.6
Children's Book Publishing and Distribution | Book Fairs |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues |  | 97.4 | 91.5 | 343.3 | 334.6
Children's Book Publishing and Distribution | Trade |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues |  | 65.6 | 52.4 | 222.9 | 184.0
Education |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues |  | 60.3 | 59.5 | 179.7 | 171.4
International |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues |  | 81.8 | 83.6 | 271.9 | 276.6
International | Major Markets |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | [1] | 54.5 | 55.3 | 192.7 | 195.6
International | Other Markets |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | [2] | $ 27.3 | $ 28.3 | $ 79.2 | $ 81.0
[1] | Includes Canada, UK, Australia and New Zealand.
[2] | Primarily includes markets in Asia.

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