Revenues - Disaggregation of Revenue Data (Details) - USD ($) $ in Millions	12 Months Ended
May 31, 2024	May 31, 2023	May 31, 2022
Disaggregation of Revenue [Line Items]
Revenues	$ 1,589.7	$ 1,704.0	$ 1,642.9
Total revenue, excluding rental income	1,580.0	1,704.0	1,642.9
Rental income	9.7	7.1	6.1
Childrens Book Publishing And Distribution
Disaggregation of Revenue [Line Items]
Revenues	955.2	1,038.0	946.5
Childrens Book Publishing And Distribution \| Operating Segments
Disaggregation of Revenue [Line Items]
Revenues	955.2	1,038.0	946.5
Childrens Book Publishing And Distribution \| Trade
Disaggregation of Revenue [Line Items]
Revenues	300.6	325.8	344.0
Childrens Book Publishing And Distribution \| Trade - International
Disaggregation of Revenue [Line Items]
Revenues	50.3	41.3	46.4
Childrens Book Publishing And Distribution \| Book Clubs
Disaggregation of Revenue [Line Items]
Revenues	62.7	117.8	126.4
Childrens Book Publishing And Distribution \| Book Fairs
Disaggregation of Revenue [Line Items]
Revenues	541.6	553.1	429.7
Education
Disaggregation of Revenue [Line Items]
Revenues	351.2	386.6	393.6
Education \| Operating Segments
Disaggregation of Revenue [Line Items]
Revenues	351.2	386.6	393.6
International Segment
Disaggregation of Revenue [Line Items]
Revenues	273.6	279.4	302.8
International Segment \| Operating Segments
Disaggregation of Revenue [Line Items]
Revenues	273.6	279.4	302.8
International Segment \| Major Markets
Disaggregation of Revenue [Line Items]
Revenues	228.6	229.7	237.1
International Segment \| Other Markets
Disaggregation of Revenue [Line Items]
Revenues	$ 45.0	$ 49.7	$ 65.7

Revenue from Contract with Customer, Excluding Rental Income, Excluding Assessed Tax

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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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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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