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Revenues - Disaggregation of Revenue Data (Details) - USD ($) $ in Millions	12 Months Ended
	May 31, 2023	May 31, 2022	May 31, 2021
Disaggregation of Revenue [Line Items]
Revenues	$ 1,704.0	$ 1,642.9	$ 1,300.3
Revenue Benchmark | Customer Concentration Risk
Disaggregation of Revenue [Line Items]
Customer with over 10% of revenues			152.7
Revenue Benchmark | Customer Concentration Risk | Customer 1
Disaggregation of Revenue [Line Items]
Percentage of total revenues			12.00%
Childrens Book Publishing And Distribution
Disaggregation of Revenue [Line Items]
Revenues	1,038.0	946.5	$ 675.0
Childrens Book Publishing And Distribution | Operating Segments
Disaggregation of Revenue [Line Items]
Revenues	1,038.0	946.5	675.0
Childrens Book Publishing And Distribution | Trade
Disaggregation of Revenue [Line Items]
Revenues	325.8	344.0	328.8
Childrens Book Publishing And Distribution | Trade - International
Disaggregation of Revenue [Line Items]
Revenues	41.3	46.4	36.5
Childrens Book Publishing And Distribution | Book Clubs
Disaggregation of Revenue [Line Items]
Revenues	117.8	126.4	145.4
Childrens Book Publishing And Distribution | Book Fairs
Disaggregation of Revenue [Line Items]
Revenues	553.1	429.7	$ 164.3
Childrens Book Publishing And Distribution | Revenue Benchmark | Customer Concentration Risk
Disaggregation of Revenue [Line Items]
Customer with over 10% of revenues			119.7
Education
Disaggregation of Revenue [Line Items]
Revenues	386.6	393.6	$ 312.3
Education | Operating Segments
Disaggregation of Revenue [Line Items]
Revenues	386.6	393.6	$ 312.3
Education | Revenue Benchmark | Customer Concentration Risk
Disaggregation of Revenue [Line Items]
Customer with over 10% of revenues			8.8
International Segment
Disaggregation of Revenue [Line Items]
Revenues	279.4	302.8	$ 313.0
International Segment | Operating Segments
Disaggregation of Revenue [Line Items]
Revenues	279.4	302.8	313.0
International Segment | Major Markets
Disaggregation of Revenue [Line Items]
Revenues	229.7	237.1	226.8
International Segment | Other Markets
Disaggregation of Revenue [Line Items]
Revenues	$ 49.7	$ 65.7	$ 86.2
International Segment | Revenue Benchmark | Customer Concentration Risk
Disaggregation of Revenue [Line Items]
Customer with over 10% of revenues			24.2

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