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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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