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Goodwill and Intangible Assets (Details 1) - USD ($) $ in Thousands | 12 Months Ended |  |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
May 31, 2016 | May 31, 2015 | Feb. 29, 2016 | Nov. 30, 2015 | Aug. 31, 2015 | Feb. 28, 2015 | Nov. 30, 2014 | Aug. 31, 2014 | May 31, 2014 | May 31, 2013 | May 31, 2012
Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross carrying value, finite and indefinite intangible assets total | $ 278,927 | $ 276,105 |  |  |  |  |  |  |  |  |
Accumulated amortization | (112,350) | (94,453) |  |  |  |  |  |  |  |  |
Net carrying value, finite and indefinite intangible assets total | 166,577 | 181,652 | $ 167,926 | $ 172,357 | $ 177,245 | $ 186,393 | $ 197,187 | $ 201,215 | $ 205,053 | $ 214,523 | $ 147,195
Product technologies |  |  |  |  |  |  |  |  |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross carrying value, finite-lived intangible assets | 148,387 | 148,776 |  |  |  |  |  |  |  |  |
Accumulated amortization | (51,313) | (41,447) |  |  |  |  |  |  |  |  |
Net carrying value, finite-lived intangible assets | $ 97,074 | $ 107,329 |  |  |  |  |  |  |  |  |
Weighted average useful life | 10 years 2 months 12 days | 10 years 2 months 12 days |  |  |  |  |  |  |  |  |
Customer relationships |  |  |  |  |  |  |  |  |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross carrying value, finite-lived intangible assets | $ 88,389 | $ 86,371 |  |  |  |  |  |  |  |  |
Accumulated amortization | (47,133) | (42,813) |  |  |  |  |  |  |  |  |
Net carrying value, finite-lived intangible assets | $ 41,256 | $ 43,558 |  |  |  |  |  |  |  |  |
Weighted average useful life | 11 years 10 months 24 days | 12 years |  |  |  |  |  |  |  |  |
Trademarks |  |  |  |  |  |  |  |  |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross carrying value, finite-lived intangible assets |  | $ 28,545 |  |  |  |  |  |  |  |  |
Gross carrying value, indefinite-lived intangible assets | $ 28,470 |  |  |  |  |  |  |  |  |  |
Accumulated amortization | (6,242) | (3,383) |  |  |  |  |  |  |  |  |
Net carrying value, finite-lived intangible assets |  | $ 25,162 |  |  |  |  |  |  |  |  |
Net carrying value, indefinite-lived intangible assets | $ 22,228 |  |  |  |  |  |  |  |  |  |
Weighted average useful life | 10 years 8 months 12 days | 10 years 8 months 12 days |  |  |  |  |  |  |  |  |
Licenses |  |  |  |  |  |  |  |  |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross carrying value, finite-lived intangible assets | $ 7,931 | $ 7,913 |  |  |  |  |  |  |  |  |
Accumulated amortization | (6,716) | (5,910) |  |  |  |  |  |  |  |  |
Net carrying value, finite-lived intangible assets | $ 1,215 | $ 2,003 |  |  |  |  |  |  |  |  |
Weighted average useful life | 7 years 7 months 6 days | 8 years 3 months 18 days |  |  |  |  |  |  |  |  |
Distributor relationships |  |  |  |  |  |  |  |  |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross carrying value, finite-lived intangible assets | $ 2,150 | $ 900 |  |  |  |  |  |  |  |  |
Accumulated amortization | (946) | (900) |  |  |  |  |  |  |  |  |
Net carrying value, finite-lived intangible assets | $ 1,204 | $ 0 |  |  |  |  |  |  |  |  |
Weighted average useful life | 5 years 2 months 12 days | 3 years |  |  |  |  |  |  |  |  |
In process R&D |  |  |  |  |  |  |  |  |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross carrying value, indefinite-lived intangible assets | $ 3,600 | $ 3,600 |  |  |  |  |  |  |  |  |
Net carrying value, indefinite-lived intangible assets | $ 3,600 | $ 3,600 |  |  |  |  |  |  |  |  |

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