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Acquisitions (Details) £ in Millions, $ in Millions	12 Months Ended
	May 31, 2017 USD ($)	May 31, 2016 USD ($)	May 31, 2016 GBP (£)	May 31, 2015 USD ($)
Business Acquisition [Line Items]
Acquisition related payments net of cash acquired	$ 10.1	$ 3.7		$ 8.3
Ooka Island, Inc. [Member]
Business Acquisition [Line Items]
Equity interest acquired (percent)	100.00%
Acquisition related payments net of cash acquired	$ 9.7
Net assets acquired	6.9
Intangible assets acquired	6.8
Goodwill expected to be deductible	2.8
Troubadour, Limited [Member]
Business Acquisition [Line Items]
Equity interest acquired (percent)		100.00%
Acquisition related payments net of cash acquired		$ 3.2	£ 0.0
Intangible assets acquired		1.9
Net assets acquired		3.2
U.S. Based Book Fair Business [Member]
Business Acquisition [Line Items]
Acquisition related payments net of cash acquired	0.4	0.5
Intangible assets acquired	$ 0.2	$ 0.5

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

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-Publisher FASB
-Name Accounting Standards Codification
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The amount of goodwill arising from a business combination that is expected to be deductible for tax purposes.

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Amount of intangible assets, excluding goodwill, acquired at the acquisition date.

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Amount recognized as of the acquisition date for the identifiable assets acquired in excess of (less than) the aggregate liabilities assumed.

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Amount recognized for assets, including goodwill, in excess of (less than) the aggregate liabilities assumed.

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