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Amortizable of Intangible Assets (Detail) - USD ($) $ in Thousands | May 31, 2020 | May 31, 2019
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Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 96,054 | $ 92,931
Less Accumulated Amortization | 44,690 | 40,835
Net Carrying Amount | 51,364 | 52,096
Licenses |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 10,346 | 9,813
Less Accumulated Amortization | 3,330 | 3,182
Net Carrying Amount | 7,016 | 6,631
Noncompete Agreements |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 706 | 862
Less Accumulated Amortization | 407 | 542
Net Carrying Amount | 299 | 320
Patents |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 8,509 | 8,158
Less Accumulated Amortization | 4,118 | 3,570
Net Carrying Amount | 4,391 | 4,588
Customer-based intangibles |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 59,847 | 57,634
Less Accumulated Amortization | 29,898 | 28,017
Net Carrying Amount | 29,949 | 29,617
Other products and service-related intangibles |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 16,646 | 16,464
Less Accumulated Amortization | 6,937 | 5,524
Net Carrying Amount | $ 9,709 | $ 10,940

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