Revenues - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Nov. 30, 2023	Nov. 30, 2022	Nov. 30, 2023	Nov. 30, 2022
Disaggregation of Revenue [Line Items]
Revenues	$ 562.6	$ 587.9	$ 791.1	$ 850.8
Total Revenues excluding rental income	560.3	587.9	786.3	850.8
Lease Income	2.3	1.6	4.8	3.1
Children's Book Publishing & Distribution
Disaggregation of Revenue [Line Items]
Revenues	392.8	418.3	495.6	543.0
Children's Book Publishing & Distribution \| Operating Segments
Disaggregation of Revenue [Line Items]
Revenues	392.8	418.3	495.6	543.0
Children's Book Publishing & Distribution \| Book Clubs - U.S.
Disaggregation of Revenue [Line Items]
Revenues	32.4	57.6	35.0	63.9
Children's Book Publishing & Distribution \| Book Fairs - U.S.
Disaggregation of Revenue [Line Items]
Revenues	242.1	240.8	269.4	269.1
Children's Book Publishing & Distribution \| Trade - U.S.
Disaggregation of Revenue [Line Items]
Revenues	101.0	107.9	163.5	184.1
Children's Book Publishing & Distribution \| Trade - International
Disaggregation of Revenue [Line Items]
Revenues	17.3	12.0	27.7	25.9
Education
Disaggregation of Revenue [Line Items]
Revenues	81.0	80.0	147.0	153.2
Education \| Operating Segments
Disaggregation of Revenue [Line Items]
Revenues	81.0	80.0	147.0	153.2
International
Disaggregation of Revenue [Line Items]
Revenues	86.5	89.6	143.7	154.6
International \| Operating Segments
Disaggregation of Revenue [Line Items]
Revenues	86.5	89.6	143.7	154.6
International \| Major Markets
Disaggregation of Revenue [Line Items]
Revenues	75.4	77.1	123.2	130.5
International \| Other Markets
Disaggregation of Revenue [Line Items]
Revenues	$ 11.1	$ 12.5	$ 20.5	$ 24.1

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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