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Other Financial Data (Details) - Other Financial Data - Balance Sheet - USD ($) $ in Millions	12 Months Ended
	May 31, 2016	May 31, 2015	May 31, 2014	May 31, 2013
Other Financial Data - Balance Sheet [Abstract]
Prepublication and production costs	$ 42.0	$ 51.7
Unredeemed credits issued in conjunction with the Company’s school-based book club and book fair operations (included in other accrued expenses)	8.9	9.3
Reserve For Return [Member]
Other Financial Data - Balance Sheet [Abstract]
Accounts receivable reserve for returns	$ 32.1	$ 27.9	$ 27.0	$ 26.0

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- Definition

Carrying amount as of the balance sheet date of capitalized value of prepublication and production costs.

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- Definition

The increase (decrease) during the reporting period in the aggregate amount of liabilities that result from activities that generate operating income.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585

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Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 09
-Article 12

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