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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