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This item represents an other than temporary decline in value that has been recognized against an investment accounted for under the equity method of accounting. The excess of the carrying amount over the fair value of the investment represents the amount of the write down which is or was reflected in earnings. The written down value is a new cost basis with the adjusted value of the investment becoming its new carrying value subject to the equity accounting method. Evidence of a loss in value might include, but would not necessarily be limited to, absence of an ability to recover the carrying amount of the investment or inability of the investee to sustain an earnings capacity which would justify the carrying amount of the investment.

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

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Amount of income (loss) for proportionate share of equity method investee's income (loss).

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Amount of investment in equity method investee and investment in and advance to affiliate.

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Percentage investment held by members or limited partners of limited liability company (LLC) or limited partnership (LP).

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Investments (Details) - USD ($)	3 Months Ended		9 Months Ended
Investments (Details) - USD ($)	Feb. 28, 2021	Feb. 29, 2020	Feb. 28, 2021	Feb. 29, 2020	May 31, 2020
Investments (Details) [Line Items]
Investments	$ 39,800,000	$ 32,400,000	$ 39,800,000	$ 32,400,000	$ 31,000,000.0
Income from equity method investments	$ 700,000	600,000	6,100,000	3,600,000
Equity method investment, impairment			$ 0
Children's Book Publishing and Distribution
Investments (Details) [Line Items]
Equity method ownership percentage	26.20%		26.20%
Financing and Production Company \| Financing and Production Company
Investments (Details) [Line Items]
Other equity percentage			4.60%
International
Investments (Details) [Line Items]
Equity method investment	$ 33,800,000	26,400,000	$ 33,800,000	26,400,000	25,000,000.0
Children's Book Publishing and Distribution \| Other Investments
Investments (Details) [Line Items]
Investments	$ 6,000,000.0	$ 6,000,000.0	$ 6,000,000.0	$ 6,000,000.0	$ 6,000,000.0