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Amortizable of Intangible Assets (Detail) - USD ($) $ in Thousands | May 31, 2016 | May 31, 2015
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Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 74,162 | $ 57,897
Less Accumulated Amortization | 24,807 | 20,523
Net Carrying Amount | 49,355 | 37,374
Licenses |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 5,189 | 4,919
Less Accumulated Amortization | 1,782 | 1,630
Net Carrying Amount | 3,407 | 3,289
Noncompete Agreements |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 491 | 428
Less Accumulated Amortization | 193 | 124
Net Carrying Amount | 298 | 304
Patents |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 8,040 | 7,701
Less Accumulated Amortization | 3,631 | 3,087
Net Carrying Amount | 4,409 | 4,614
Customer-based intangibles |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 48,186 | 38,616
Less Accumulated Amortization | 17,277 | 14,446
Net Carrying Amount | 30,909 | 24,170
Other product and service-related intangibles |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 12,256 | 6,233
Less Accumulated Amortization | 1,924 | 1,236
Net Carrying Amount | $ 10,332 | $ 4,997

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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=66006027&loc=d3e16323-109275 + Details
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