Asset Write Down (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended	9 Months Ended
Feb. 29, 2020	Feb. 28, 2019	Feb. 29, 2020	Feb. 28, 2019
Asset Impairment Charges [Abstract]
Asset impairments and write downs	$ 40.0	$ 0.0	$ 40.0	$ 0.0
Inventory, net of reserves	37.6		$ 37.6
Author advances	1.6
Prepublication costs	$ 0.8
Common Class A
Class of Stock [Line Items]
Impact on earnings per share (USD per share)	$ 0.84		$ 0.84

Asset Impairment Charges, Impact On Earnings Per Share, Basic And Diluted

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Inventory Write-down, Author Advances

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Inventory Write-down, Prepublication Costs

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Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of merchandise or goods held by the company that are readily available for sale.

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