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Amortizable of Intangible Assets (Detail) - USD ($) $ in Thousands | May 31, 2018 | May 31, 2017
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Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 91,704 | $ 85,395
Less Accumulated Amortization | 37,049 | 30,777
Net Carrying Amount | 54,655 | 54,618
Licenses |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 9,491 | 5,989
Less Accumulated Amortization | 2,523 | 2,011
Net Carrying Amount | 6,968 | 3,978
Noncompete Agreements |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 801 | 1,208
Less Accumulated Amortization | 483 | 309
Net Carrying Amount | 318 | 899
Patents |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 9,693 | 9,304
Less Accumulated Amortization | 5,013 | 4,601
Net Carrying Amount | 4,680 | 4,703
Customer-based intangibles |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 56,420 | 56,829
Less Accumulated Amortization | 24,579 | 20,846
Net Carrying Amount | 31,841 | 35,983
Other products and service-related intangibles |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 15,299 | 12,065
Less Accumulated Amortization | 4,451 | 3,010
Net Carrying Amount | $ 10,848 | $ 9,055

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