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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 |

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- Definition Indefinite lived intangible assets excluding goodwill net. + References No definition available. + Details
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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Amount of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16212-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph ((a)(1),(b)) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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