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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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