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Amortizable of Intangible Assets (Detail) - USD ($) $ in Thousands | May. 31, 2015 | May. 31, 2014
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Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 57,897 | $ 54,143
Less Accumulated Amortization | 20,523 | 17,409
Net Carrying Amount | 37,374 | 36,734
Licenses |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 4,919 | 6,701
Less Accumulated Amortization | 1,630 | 1,873
Net Carrying Amount | 3,289 | 4,828
Noncompete Agreements |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 428 | 474
Less Accumulated Amortization | 124 | 256
Net Carrying Amount | 304 | 218
Patents |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 7,701 | 5,990
Less Accumulated Amortization | 3,087 | 2,746
Net Carrying Amount | 4,614 | 3,244
Customer Relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 38,616 | 37,145
Less Accumulated Amortization | 14,446 | 11,915
Net Carrying Amount | 24,170 | 25,230
Other product and service-related intangibles |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 6,233 | 3,833
Less Accumulated Amortization | 1,236 | 619
Net Carrying Amount | $ 4,997 | $ 3,214

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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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