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Revenues - Disaggregation of Revenue Data (Details) - USD ($) $ in Millions	12 Months Ended
	May 31, 2021	May 31, 2020	May 31, 2019
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 1,300.3	$ 1,487.1	$ 1,653.9
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 | Revenue Benchmark | Customer Concentration Risk
Disaggregation of Revenue [Line Items]
Customer with over 10% of revenues	119.7
Childrens Book Publishing And Distribution | Book Clubs
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 145.1	156.8	212.4
Childrens Book Publishing And Distribution | Book Fairs
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	164.3	383.8	499.6
Childrens Book Publishing And Distribution | Trade
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 328.9	306.8	275.4
Education | Revenue Benchmark | Customer Concentration Risk
Disaggregation of Revenue [Line Items]
Customer with over 10% of revenues	8.8
Education | Education
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 311.7	287.1	297.3
International | Revenue Benchmark | Customer Concentration Risk
Disaggregation of Revenue [Line Items]
Customer with over 10% of revenues	24.2
International | Major Markets
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 256.0	256.6	257.9
International | Other Markets
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 94.3	$ 96.0	$ 111.3

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Description of risks that arise due to the volume of business transacted with a particular customer. At a minimum, the description informs financial statement users of the general nature of the risk, but excludes "Information about Major Customers" that may be disclosed elsewhere (for instance, segment disclosures).

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