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Revenues - Disaggregation of Revenue Data (Details) - USD ($) $ in Millions	12 Months Ended
	May 31, 2019	May 31, 2018	May 31, 2017
Disaggregation of Revenue [Line Items]
Revenues	$ 1,653.9	$ 1,628.4	$ 1,741.6
Childrens Book Publishing And Distribution
Disaggregation of Revenue [Line Items]
Revenues	990.3	970.2
Childrens Book Publishing And Distribution | Book Clubs
Disaggregation of Revenue [Line Items]
Revenues	212.4	224.3
Childrens Book Publishing And Distribution | Book Fairs
Disaggregation of Revenue [Line Items]
Revenues	499.6	513.6
Childrens Book Publishing And Distribution | Trade [Member]
Disaggregation of Revenue [Line Items]
Revenues	278.3	232.3
Education
Disaggregation of Revenue [Line Items]
Revenues	297.4	288.6
International
Disaggregation of Revenue [Line Items]
Revenues	366.2	369.6
International | Major Markets
Disaggregation of Revenue [Line Items]
Revenues	254.9	258.3
International | Other Markets
Disaggregation of Revenue [Line Items]
Revenues	$ 111.3	$ 111.3

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- Definition

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.

+ References

No definition available.

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- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 32
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8933-108599

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599

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