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Goodwill and Other Intangibles (Details) $ in Millions	12 Months Ended
	May 31, 2019 USD ($)	May 31, 2018 USD ($) business	May 31, 2017 USD ($)
Goodwill and Other Intangibles (Details) [Line Items]
Goodwill	$ 6.3	$ 0.0
Intangible assets acquired	4.5	3.3
Amortization expense	$ 2.8	2.1	$ 2.5
Useful life of intangible assets	5 years 6 months
U.K. Book Publishing Business [Member]
Goodwill and Other Intangibles (Details) [Line Items]
Intangible assets acquired	$ 3.9
U.S. Based Book Fair Business [Member]
Goodwill and Other Intangibles (Details) [Line Items]
Intangible assets acquired	0.3	$ 1.8
Number of businesses acquired | business		2
U.K. Based Book Business [Member]
Goodwill and Other Intangibles (Details) [Line Items]
Intangible assets acquired	$ 0.3	$ 1.5

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- Definition

-- None. No documentation exists for this element. --

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- Definition

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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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
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- Definition

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.

+ References

No definition available.

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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)
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Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

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The number of businesses acquired by the entity during the period.

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