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Acquisitions (Details) £ in Millions, $ in Millions			12 Months Ended
	Sep. 08, 2015 USD ($)	Sep. 08, 2015 GBP (£)	May 31, 2016 USD ($)	May 31, 2015 USD ($)	May 31, 2014 USD ($)
Business Acquisition [Line Items]
Acquisition related payments			$ 3.7	$ 8.3	$ 1.0
Troubadour, Limited [Member]
Business Acquisition [Line Items]
Equity interest acquired (percent)	100.00%
Acquisition related payments	$ 3.2	£ 0.0
Intangible assets acquired	1.9
U.S. Based Book Fair Business [Member]
Business Acquisition [Line Items]
Acquisition related payments			$ 0.5
Intangible assets acquired	$ 0.5

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Percentage of voting equity interests acquired at the acquisition date in the business combination.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
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Amount of intangible assets, excluding goodwill, acquired at the acquisition date.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=56956791&loc=d3e4845-128472

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The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3213-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Investing Activities
-URI http://asc.fasb.org/extlink&oid=6516133

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