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Description of the Business, Basis of Presentation and Summary of Significant Accounting Policies (Details) $ in Millions		12 Months Ended			38 Months Ended
	Mar. 27, 2019	May 31, 2021 USD ($) segment	May 31, 2020 USD ($)	May 31, 2019 USD ($)	May 31, 2021 USD ($) segment
Property, Plant and Equipment [Line Items]
Number of countries in which entity operates		165			165
Allowance for doubtful accounts receivable		$ 21.4	$ 19.9		$ 21.4
Capitalized computer software, net		59.4	52.3		59.4
Capitalized computer software, amortization expense		$ 27.6	27.3	$ 25.3
Useful life of intangible assets		5 years 4 months 24 days
Royalty advances, net		$ 115.5	109.5		$ 115.5
Reporting units subject to goodwill impairment | segment		7			7
Advertising expense		$ 60.1	85.2	106.8
Capitalized costs		4.6	11.9		$ 4.6
Hosting Arrangement, Service Contract, Implementation Cost, Expense, Amortization		$ 0.7	0.0
Amount of stock repurchased in period			$ 35.5	$ 8.5
Board Authorized 2018 Share Repurchase Program
Property, Plant and Equipment [Line Items]
Amount of stock repurchased in period					$ 32.7
Make Believe Ideas Limited (MBI)
Property, Plant and Equipment [Line Items]
Subsidiary or Equity Method Investee, Cumulative Percentage Ownership after All Transactions	95.00%
Subsidiary or Equity Method Investee, Cumulative Percentage Ownership after All Transactions	95.00%
Make Believe Ideas Limited (MBI) | Make Believe Ideas Limited (MBI)
Property, Plant and Equipment [Line Items]
Noncontrolling ownership percentage	5.00%
Minimum
Property, Plant and Equipment [Line Items]
Initial term		3 years
Maximum
Property, Plant and Equipment [Line Items]
Initial term		10 years
Building
Property, Plant and Equipment [Line Items]
Depreciable life		40 years
Building Improvements
Property, Plant and Equipment [Line Items]
Depreciable life		25 years
Capitalized Software | Minimum
Property, Plant and Equipment [Line Items]
Depreciable life		3 years
Capitalized Software | Maximum
Property, Plant and Equipment [Line Items]
Depreciable life		7 years
Furniture and Fixtures
Property, Plant and Equipment [Line Items]
Depreciable life		10 years
Customer Lists | Minimum
Property, Plant and Equipment [Line Items]
Useful life of intangible assets		5 years
Customer Lists | Maximum
Property, Plant and Equipment [Line Items]
Useful life of intangible assets		10 years
Prepublication Costs | Minimum
Property, Plant and Equipment [Line Items]
Useful life of intangible assets		2 years
Prepublication Costs | Maximum
Property, Plant and Equipment [Line Items]
Useful life of intangible assets		5 years
Intellectual Property
Property, Plant and Equipment [Line Items]
Useful life of intangible assets		5 years

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