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Acquisition, Restructuring and Other Items, net (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
May 31, 2018 | May 31, 2017 | May 31, 2016
Restructuring Cost and Reserve [Line Items] |  |  |
Total | $ 15,432 | $ 27,510 | $ 12,591
Legal |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Total | 10,067 | 19,480 | 7,487
Intangible and other asset impairment |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Total | 0 | 5,604 | 352
Restructuring |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Total | 4,674 | 1,348 | 1,462
Other |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Total | $ 691 | $ 1,078 | $ 3,290

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