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Goodwill and Intangible Assets (Details 1) - USD ($)
$ in Thousands
May 31, 2018
May 31, 2017
Indefinite-lived Intangible Assets [Line Items]    
Gross carrying value, finite-lived intangible assets $ 239,005 $ 237,684
Accumulated amortization (108,695) (92,009)
Net carrying value, finite-lived intangible assets 130,310 145,675
Product technologies    
Indefinite-lived Intangible Assets [Line Items]    
Gross carrying value, finite-lived intangible assets 147,175 147,172
Accumulated amortization (68,880) (59,696)
Net carrying value, finite-lived intangible assets 78,295 87,476
Customer relationships    
Indefinite-lived Intangible Assets [Line Items]    
Gross carrying value, finite-lived intangible assets 56,428 56,375
Accumulated amortization (23,237) (19,194)
Net carrying value, finite-lived intangible assets 33,191 37,181
Trademarks    
Indefinite-lived Intangible Assets [Line Items]    
Gross carrying value, finite-lived intangible assets 28,400 28,400
Accumulated amortization (11,809) (9,069)
Net carrying value, finite-lived intangible assets 16,591 19,331
Licenses    
Indefinite-lived Intangible Assets [Line Items]    
Gross carrying value, finite-lived intangible assets 5,752 4,487
Accumulated amortization (4,357) (3,821)
Net carrying value, finite-lived intangible assets 1,395 666
Distributor relationships    
Indefinite-lived Intangible Assets [Line Items]    
Gross carrying value, finite-lived intangible assets 1,250 1,250
Accumulated amortization (412) (229)
Net carrying value, finite-lived intangible assets $ 838 $ 1,021