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Revenues - Disaggregation of Revenue (Details) - USD ($) $ in Millions | 3 Months Ended
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Aug. 31, 2018 | Aug. 31, 2017
Disaggregation of Revenue [Line Items] |  |  |
Revenues |  | $ 218.4 | $ 189.2
Children's Book Publishing and Distribution |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues |  | 93.3 | 66.8
Children's Book Publishing and Distribution | Book Clubs |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues |  | 9.1 | 8.0
Children's Book Publishing and Distribution | Book Fairs |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues |  | 25.2 | 12.1
Children's Book Publishing and Distribution | Trade |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues |  | 59.0 | 46.7
Education |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues |  | 50.3 | 45.0
International |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues |  | 74.8 | 77.4
International | Major Markets |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | [1] | 50.3 | 51.7
International | Other Markets |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | [2] | $ 24.5 | $ 25.7
[1] | Includes Canada, UK, Australia and New Zealand
[2] | .

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