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Amortizable of Intangible Assets (Detail) - USD ($) $ in Thousands | May 31, 2017 | May 31, 2016
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Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 85,395 | $ 74,162
Less Accumulated Amortization | 30,777 | 24,807
Net Carrying Amount | 54,618 | 49,355
Licenses |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 5,989 | 5,189
Less Accumulated Amortization | 2,011 | 1,782
Net Carrying Amount | 3,978 | 3,407
Noncompete Agreements |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 1,208 | 491
Less Accumulated Amortization | 309 | 193
Net Carrying Amount | 899 | 298
Patents |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 9,304 | 8,040
Less Accumulated Amortization | 4,601 | 3,631
Net Carrying Amount | 4,703 | 4,409
Customer-based intangibles |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 56,829 | 48,186
Less Accumulated Amortization | 20,846 | 17,277
Net Carrying Amount | 35,983 | 30,909
Other products and service-related intangibles |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 12,065 | 12,256
Less Accumulated Amortization | 3,010 | 1,924
Net Carrying Amount | $ 9,055 | $ 10,332

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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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