Revenues - Disaggregation of Revenue Data (Details) - USD ($) $ in Millions	12 Months Ended
May 31, 2025	May 31, 2024	May 31, 2023
Disaggregation of Revenue [Line Items]
Revenues	$ 1,625.5	$ 1,589.7	$ 1,704.0
Total revenue, excluding rental income			1,704.0
Rental income	11.2	9.7	7.1
Overhead
Disaggregation of Revenue [Line Items]
Revenues	11.2	9.7	0.0
Childrens Book Publishing And Distribution \| Operating Segments
Disaggregation of Revenue [Line Items]
Revenues	963.9	953.3	1,019.0
Childrens Book Publishing And Distribution \| Trade \| Operating Segments
Disaggregation of Revenue [Line Items]
Revenues	304.7	298.7	306.8
Childrens Book Publishing And Distribution \| Trade - International \| Operating Segments
Disaggregation of Revenue [Line Items]
Revenues	46.7	50.3	41.3
Childrens Book Publishing And Distribution \| Book Clubs \| Operating Segments
Disaggregation of Revenue [Line Items]
Revenues	64.2	62.7	117.8
Childrens Book Publishing And Distribution \| Book Fairs \| Operating Segments
Disaggregation of Revenue [Line Items]
Revenues	548.3	541.6	553.1
Education \| Operating Segments
Disaggregation of Revenue [Line Items]
Revenues	309.8	351.2	386.6
International \| Operating Segments
Disaggregation of Revenue [Line Items]
Revenues	279.6	273.6	279.4
International \| Major Markets \| Operating Segments
Disaggregation of Revenue [Line Items]
Revenues	241.6	228.6	229.7
International \| Other Markets \| Operating Segments
Disaggregation of Revenue [Line Items]
Revenues	38.0	45.0	49.7
Entertainment \| Operating Segments
Disaggregation of Revenue [Line Items]
Revenues	61.0	1.9	19.0
Entertainment \| Entertainment - U.S. \| Operating Segments
Disaggregation of Revenue [Line Items]
Revenues	5.2	1.9	19.0
Entertainment \| Entertainment - International \| Operating Segments
Disaggregation of Revenue [Line Items]
Revenues	$ 55.8	$ 0.0	$ 0.0

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of lease income from operating, direct financing, and sales-type leases. Includes, but is not limited to, variable lease payments, interest income, profit (loss) recognized at commencement, and lease payments paid and payable to lessor.

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