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Acquisitions (Details) - USD ($) $ in Millions | 12 Months Ended
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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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- 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 + Details
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