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Goodwill and Intangible Assets - Intangible Assets (Detail) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Nov. 30, 2015 | May. 31, 2015
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying value, excluding goodwill | $ 275,670 | $ 276,105
Accumulated amortization | (103,159) | (94,299)
Net carrying value, excluding goodwill | 172,511 | 181,806
Product Technologies [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying value, finite intangible items | 148,390 | 148,776
Accumulated amortization | (46,355) | (41,447)
Net carrying value, finite intangible items | $ 102,035 | $ 107,329
Weighted avg useful life | 10 years 2 months 12 days | 10 years 2 months 12 days
Customer Relationships [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying value, finite intangible items | $ 86,322 | $ 86,371
Accumulated amortization | (44,895) | (42,813)
Net carrying value, finite intangible items | $ 41,427 | $ 43,558
Weighted avg useful life | 12 years | 12 years
Trademark NAMIC [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted avg useful life | 10 years 8 months 12 days | 10 years 8 months 12 days
Licenses [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying value, finite intangible items | $ 3,600 | $ 3,600
Accumulated amortization | 0 | 0
Net carrying value, finite intangible items | 3,600 | 3,600
Trademarks [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying value, finite intangible items | 7,913 | 7,913
Accumulated amortization | (6,313) | (5,910)
Net carrying value, finite intangible items | $ 1,600 | $ 2,003
Weighted avg useful life | 7 years 7 months 12 days | 8 years 3 months 12 days
Distributor Relationships [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted avg useful life | 3 years | 3 years
Research and Development [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying value, indefinite items | $ 900 | $ 900
Accumulated amortization | (900) | (900)
Net carrying value, indefinite items | 0 | 0
Trademark NAMIC [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying value, indefinite items | 28,545 | 28,545
Accumulated amortization | (4,696) | (3,229)
Net carrying value, indefinite items | $ 23,849 | $ 25,316

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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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