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Goodwill and Other Intangibles (Details) - USD ($) $ in Millions	12 Months Ended
	May 31, 2017	May 31, 2016	May 31, 2015
Goodwill and Other Intangibles (Details) [Line Items]
Additions	$ 7.0	$ 2.4
Amortization expense	$ 2.5	2.2	$ 1.9
Useful life of intangible assets	5 years
U.S. Based Book Fair Business [Member]
Goodwill and Other Intangibles (Details) [Line Items]
Additions	$ 0.2	0.5
Digital Phonics Business [Member]
Goodwill and Other Intangibles (Details) [Line Items]
Additions	$ 6.8
Finite-Lived Intangible Assets [Member] | Troubadour, Limited [Member]
Goodwill and Other Intangibles (Details) [Line Items]
Additions		$ 1.9

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- Definition

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

+ References

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://www.xbrl.org/2003/role/presentationRef
-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

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585

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-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

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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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- Definition

Amount of increase in assets, excluding financial assets, lacking physical substance with a definite life, from an acquisition.

+ References

No definition available.

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