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

No definition available.

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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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(2)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274

+ Details

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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.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- 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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- Definition

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

+ References

No definition available.

+ Details

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- Details

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- Details

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Goodwill and Other Intangibles (Details) $ in Millions	12 Months Ended
Goodwill and Other Intangibles (Details) $ in Millions	May 31, 2018 USD ($) business	May 31, 2017 USD ($)	May 31, 2016 USD ($)
Goodwill and Other Intangibles (Details) [Line Items]
Intangible assets acquired	$ 3.3	$ 7.0
Amortization expense	$ 2.1	2.5	$ 2.2
Useful life of intangible assets	4 years
U.S. Based Book Fair Business [Member]
Goodwill and Other Intangibles (Details) [Line Items]
Number of businesses acquired \| business	2
Intangible assets acquired	$ 1.8	0.2
U.K. Based Book Business [Member]
Goodwill and Other Intangibles (Details) [Line Items]
Intangible assets acquired	$ 1.5
Digital Phonics Business [Member]
Goodwill and Other Intangibles (Details) [Line Items]
Intangible assets acquired		$ 6.8