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Goodwill and Other Intangibles - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	May 31, 2025	May 31, 2024	May 31, 2023
Goodwill and Other Intangibles (Details) [Line Items]
Additions (1)	$ 64.2	$ 0.0
Goodwill, impairment loss	0.0	0.0
Additions	$ 85.3	6.0
Useful life of intangible assets	8 years 4 months 24 days
Amortization of intangible assets	$ 11.2	2.6	$ 2.2
Amortizable Intangible Assets - Educational Programs
Goodwill and Other Intangibles (Details) [Line Items]
Additions		$ 5.8
Useful life of intangible assets		8 years
Amortizable Intangible Assets - Children's Book Publishing Business
Goodwill and Other Intangibles (Details) [Line Items]
Additions		$ 0.2
Useful life of intangible assets		5 years

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The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets.

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Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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