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Acquisitions (Details) - USD ($) $ in Millions	12 Months Ended
	May 31, 2021	May 31, 2020
Business Combination, Separately Recognized Transactions [Line Items]
Intangible assets acquired	$ 0.0	$ 1.6
U.K. Book Publishing Business
Business Combination, Separately Recognized Transactions [Line Items]
Intangible assets acquired		$ 1.6
Purchase accounting adjustment to finite-lived intangible assets	$ 0.5

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Amount of increase (decrease) to assets, excluding financial assets and goodwill, lacking physical substance with a finite life for purchase accounting adjustments.

+ References

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- Definition

Amount of increase in assets, excluding financial assets, lacking physical substance with a definite life, from an acquisition.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275

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