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Property, Plant and Equipment - Schedule of Long Lived Assets by Reportable Segment (Details) - USD ($) $ in Millions	12 Months Ended
	May 31, 2023	May 31, 2022
Property, Plant and Equipment [Line Items]
Additions	$ 37.6	$ 14.4
Long-lived assets	$ 458.7	$ 456.7
Non-US
Property, Plant and Equipment [Line Items]
Disclosure on geographic areas, long-lived assets	25.9	25.4
U.S.
Property, Plant and Equipment [Line Items]
Disclosure on geographic areas, long-lived assets	432.8	431.3
Operating Segments | Children's Book Publishing and Distribution
Property, Plant and Equipment [Line Items]
Additions	$ 10.6	$ 5.7
Long-lived assets	34.4	32.3
Operating Segments | Education Solutions
Property, Plant and Equipment [Line Items]
Additions	0.3	0.5
Long-lived assets	2.1	2.7
Operating Segments | International
Property, Plant and Equipment [Line Items]
Additions	4.4	3.9
Long-lived assets	25.1	25.0
Corporate, Non-Segment | Overhead
Property, Plant and Equipment [Line Items]
Additions	22.3	4.3
Long-lived assets	$ 397.1	$ 396.7

X

- Definition

Disclosures about long-lived assets (except financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets) that are (1) located in the entity's country of domicile, and (2) located in all foreign countries in which the entity holds assets.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 41
-Subparagraph (b)
-Publisher FASB
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Long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Amount of acquisition of long-lived, physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

No definition available.

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No definition available.

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