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Goodwill and Intangible Assets (Details 1) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
May 31, 2014
May 31, 2013
Indefinite-lived Intangible Assets [Line Items]    
Gross carrying value, finite and indefinite intangible assets total $ 284,027 $ 276,737
Accumulated amortization (78,771) (61,889)
Net carrying value, finite and indefinite intangible assets total 205,256 214,848
Customer relationships [Member]
    
Indefinite-lived Intangible Assets [Line Items]    
Gross carrying value, finite-lived intangible assets 86,645 150,181
Accumulated amortization (37,848) (24,835)
Net carrying value, finite-lived intangible assets 48,797 125,346
Weighted average useful life 11 years 10 months 24 days 10 years 7 months 6 days
Product technologies [Member]
    
Indefinite-lived Intangible Assets [Line Items]    
Gross carrying value, finite-lived intangible assets 150,298 84,479
Accumulated amortization (32,930) (30,595)
Net carrying value, finite-lived intangible assets 117,368 53,884
Weighted average useful life 10 years 2 months 12 days 14 years 9 months 18 days
Licenses [Member]
    
Indefinite-lived Intangible Assets [Line Items]    
Gross carrying value, finite-lived intangible assets 7,639 6,302
Accumulated amortization (5,211) (4,501)
Net carrying value, finite-lived intangible assets 2,428 1,801
Weighted average useful life 8 years 4 months 24 days 9 years
Trademarks [Member]
    
Indefinite-lived Intangible Assets [Line Items]    
Gross carrying value, finite-lived intangible assets 6,345 6,275
Accumulated amortization (1,882) (1,058)
Net carrying value, finite-lived intangible assets 4,463 5,217
Weighted average useful life 8 years 9 years 10 months 24 days
Distributor relationships [Member]
    
Indefinite-lived Intangible Assets [Line Items]    
Gross carrying value, finite-lived intangible assets 900 900
Accumulated amortization (900) (900)
Net carrying value, finite-lived intangible assets 0 0
Weighted average useful life 3 years 3 years
Trademark-NAMIC [Member]
    
Indefinite-lived Intangible Assets [Line Items]    
Gross carrying value, indefinite-lived intangible assets 28,600 28,600
Net carrying value, indefinite-lived intangible assets 28,600 28,600
In-process R&D acquired [Member]
    
Indefinite-lived Intangible Assets [Line Items]    
Gross carrying value, indefinite-lived intangible assets 3,600  
Net carrying value, indefinite-lived intangible assets $ 3,600