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Amortizable of Intangible Assets (Detail) - USD ($) $ in Thousands | May 31, 2019 | May 31, 2018
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Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 92,931 | $ 91,704
Less Accumulated Amortization | 40,835 | 37,049
Net Carrying Amount | 52,096 | 54,655
Licenses |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 9,813 | 9,491
Less Accumulated Amortization | 3,182 | 2,523
Net Carrying Amount | 6,631 | 6,968
Noncompete Agreements |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 862 | 801
Less Accumulated Amortization | 542 | 483
Net Carrying Amount | 320 | 318
Patents |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 8,158 | 9,693
Less Accumulated Amortization | 3,570 | 5,013
Net Carrying Amount | 4,588 | 4,680
Customer-based intangibles |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 57,634 | 56,420
Less Accumulated Amortization | 28,017 | 24,579
Net Carrying Amount | 29,617 | 31,841
Other products and service-related intangibles |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 16,464 | 15,299
Less Accumulated Amortization | 5,524 | 4,451
Net Carrying Amount | $ 10,940 | $ 10,848

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