Goodwill and Other Intangibles (Details) - USD ($)	12 Months Ended
May 31, 2021	May 31, 2020	May 31, 2019
Goodwill and Other Intangibles (Details) [Line Items]
Intangible assets acquired	$ 0	$ 1,600,000
Amortization expense	$ 2,200,000	3,200,000	$ 2,800,000
Useful life of intangible assets	5 years 4 months 24 days
Goodwill, Impairment Loss	$ 0	$ 0
Impairment of Intangible Assets (Excluding Goodwill)	0
Additions to intangible assets	0
U.S. Book Publishing Business
Goodwill and Other Intangibles (Details) [Line Items]
Intangible assets acquired	1,600,000
Purchase accounting adjustment to finite-lived intangible assets	$ 500,000

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Amount of intangible assets, excluding goodwill, acquired at the acquisition date.

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Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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.

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Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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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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The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of an intangible asset (excluding goodwill) to fair value.

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