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Acquisitions (Details) $ in Millions | 12 Months Ended
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May 31, 2018 USD ($) business | May 31, 2017 USD ($) | May 31, 2016 USD ($)
Business Acquisition [Line Items] |  |  |
Intangible assets acquired | $ 3.3 | $ 7.0 |
Acquisition related payments net of cash acquired | $ 4.4 | 10.1 | $ 3.7
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 |  |
U.S. Based Book Fair Business [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Number of businesses acquired | business | 2 |  |
Intangible assets acquired | $ 1.8 | $ 0.2 |
Acquisition related payments net of cash acquired | 0.4 |  |
Intangible assets acquired | 0.2 |  |
U.K. Based Book Business [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Intangible assets acquired | $ 1.5 |  |

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