Goodwill and Intangible Assets (Details 1) (USD $) In Thousands, unless otherwise specified	6 Months Ended	12 Months Ended
Nov. 30, 2012	May 31, 2012
Schedule of Intangible assets
Gross carrying value	$ 266,157	$ 193,254
Accumulated amortization	(53,854)	(45,988)
Net carrying value	212,303	147,266
Customer relationships [Member]
Schedule of Intangible assets
Gross carrying value	82,216	82,205
Accumulated amortization	(26,344)	(22,123)
Net carrying value	55,872	60,082
Weighted average useful life	14 years 9 months 18 days	11 years 8 months 12 days
Product technologies [Member]
Schedule of Intangible assets
Gross carrying value	140,324	55,540
Accumulated amortization	(21,949)	(18,839)
Net carrying value	118,375	36,701
Weighted average useful life	13 years 3 months 18 days	11 years 3 months 18 days
Licenses [Member]
Schedule of Intangible assets
Gross carrying value	6,302	6,152
Accumulated amortization	(4,093)	(3,711)
Net carrying value	2,209	2,441
Weighted average useful life	8 years 9 months 18 days	9 years 1 month 6 days
Trademarks [Member]
Schedule of Intangible assets
Gross carrying value	4,575	4,575
Accumulated amortization	(568)	(375)
Net carrying value	4,007	4,200
Weighted average useful life	9 years 10 months 24 days	7 years 3 months 18 days
Distributor relationships [Member]
Schedule of Intangible assets
Gross carrying value	1,140	1,140
Accumulated amortization	(900)	(940)
Net carrying value	240	200
Weighted average useful life	2 years 7 months 6 days	2 years 7 months 6 days
In-process R&D acquired [Member]
Indefinite-lived Intangible Assets [Line Items]
Gross carrying value	3,000	15,042
Net carrying value	3,000	15,042
Trademark-NAMIC [Member]
Indefinite-lived Intangible Assets [Line Items]
Gross carrying value	28,600	28,600
Net carrying value	$ 28,600	$ 28,600

Indefinite lived intangible assets excluding goodwill net.

No definition available.

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- Definition

Sum of amount of carrying amount of indefinite lived assets, excluding financial assets and goodwill, lacking physical substance and amount of finite lived assets before amortization, excluding financial assets and goodwill, lacking physical substance.

+ 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=7658586&loc=d3e16323-109275

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 142

-Paragraph 45

-Subparagraph a(1)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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- Definition

Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

+ Details

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- Definition

Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

+ 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.

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- Definition

Carrying amount of assets (excluding financial assets) that lack physical substance, excluding goodwill, 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=7658586&loc=d3e16323-109275

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 142

-Paragraph 45

-Subparagraph b

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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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=7658586&loc=d3e16323-109275

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 142

-Paragraph 42, 45

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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