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Segment Information - Schedule of segment reporting information (Details) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Nov. 30, 2024 USD ($) | Nov. 30, 2023 USD ($) | Nov. 30, 2024 USD ($) segment | Nov. 30, 2023 USD ($)
Segment Reporting Information [Line Items] |  |  |  |
Number of reportable segments | segment |  |  | 4 |
Revenues | $ 544.6 | $ 562.6 | $ 781.8 | $ 791.1
Segment operating income (loss) | 74.7 | 101.3 | $ (13.8) | 2.2
Total Children's Book Publishing and Distribution |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Number of operating segments | segment |  |  | 2 |
Total Education Solutions |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Number of operating segments | segment |  |  | 1 |
Total Entertainment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Number of operating segments | segment |  |  | 1 |
Total International |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Number of operating segments | segment |  |  | 3 |
Operating Segments | Total Children's Book Publishing and Distribution |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 367.0 | 392.4 | $ 472.4 | 494.8
Segment operating income (loss) | 102.1 | 111.6 | 65.5 | 70.6
Operating Segments | Total Education Solutions |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 71.2 | 81.0 | 126.9 | 147.0
Segment operating income (loss) | (0.5) | 5.8 | (17.5) | (12.9)
Operating Segments | Total Entertainment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 16.8 | 0.4 | 33.4 | 0.8
Segment operating income (loss) | (4.7) | (0.8) | (5.2) | (1.3)
Operating Segments | Total International |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 86.7 | 86.5 | 143.5 | 143.7
Segment operating income (loss) | 5.7 | 8.0 | (2.6) | (0.2)
Corporate, Non-Segment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 2.9 | 2.3 | 5.6 | 4.8
Corporate, Non-Segment | Overhead |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 2.9 | 2.3 | 5.6 | 4.8
Segment operating income (loss) | $ (27.9) | $ (23.3) | $ (54.0) | $ (54.0)

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- Definition Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 18 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-18 + Details
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