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Goodwill and Other Intangibles - Schedule of goodwill by segment (Details) - USD ($) $ in Millions	May 31, 2023	May 31, 2022	May 31, 2021
Goodwill and Other Intangibles (Details) [Line Items]
Goodwill	$ 132.7	$ 125.3	$ 126.3
Operating Segments | Children's Book Publishing and Distribution
Goodwill and Other Intangibles (Details) [Line Items]
Goodwill	46.9	47.0
Operating Segments | Education Solutions
Goodwill and Other Intangibles (Details) [Line Items]
Goodwill	75.8	68.3
Operating Segments | International
Goodwill and Other Intangibles (Details) [Line Items]
Goodwill	$ 10.0	$ 10.0

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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