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Goodwill and Intangible Assets (Details 1) - USD ($) $ in Thousands | May 31, 2018 | May 31, 2017
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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

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