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Goodwill and Other Intangibles - Schedule of goodwill by segment (Details) - USD ($) $ in Millions	May 31, 2025	May 31, 2024	May 31, 2023
Goodwill and Other Intangibles (Details) [Line Items]
Goodwill	$ 198.9	$ 132.8	$ 132.7
Children's Book Publishing and Distribution
Goodwill and Other Intangibles (Details) [Line Items]
Goodwill	47.4	47.1
Education Solutions
Goodwill and Other Intangibles (Details) [Line Items]
Goodwill	75.7	75.7
International
Goodwill and Other Intangibles (Details) [Line Items]
Goodwill	10.1	10.0
Entertainment
Goodwill and Other Intangibles (Details) [Line Items]
Goodwill	$ 65.7	$ 0.0

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- Definition

Amount, after accumulated impairment loss, of asset representing future economic benefit arising from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized.

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