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Revenues - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Nov. 30, 2021	Nov. 30, 2020	Nov. 30, 2021	Nov. 30, 2020
Disaggregation of Revenue [Line Items]
Revenues	$ 524.2	$ 406.2	$ 784.0	$ 621.4
Children's Book Publishing and Distribution
Disaggregation of Revenue [Line Items]
Revenues	352.5	244.0	468.3	336.3
Children's Book Publishing and Distribution | Book Clubs - U.S.
Disaggregation of Revenue [Line Items]
Revenues	51.9	67.0	58.7	72.8
Children's Book Publishing and Distribution | Book Fairs - U.S.
Disaggregation of Revenue [Line Items]
Revenues	176.2	47.7	192.2	60.9
Children's Book Publishing and Distribution | Trade - U.S.
Disaggregation of Revenue [Line Items]
Revenues	109.4	116.4	189.5	182.2
Children's Book Publishing and Distribution | Trade - International
Disaggregation of Revenue [Line Items]
Revenues	15.0	12.9	27.9	20.4
Education
Disaggregation of Revenue [Line Items]
Revenues	79.5	67.5	159.6	121.1
International
Disaggregation of Revenue [Line Items]
Revenues	92.2	94.7	156.1	164.0
International | Major Markets
Disaggregation of Revenue [Line Items]
Revenues	78.8	73.1	126.3	123.1
International | Other Markets
Disaggregation of Revenue [Line Items]
Revenues	$ 13.4	$ 21.6	$ 29.8	$ 40.9

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