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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