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Amortizable of Intangible Assets (Detail) - USD ($) $ in Thousands | May 31, 2021 | May 31, 2020
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Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 130,233 | $ 96,054
Less Accumulated Amortization | 53,462 | 44,690
Net Carrying Amount | 76,771 | 51,364
Licenses |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 16,913 | 10,346
Less Accumulated Amortization | 4,580 | 3,330
Net Carrying Amount | 12,333 | 7,016
Noncompete Agreements |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 1,006 | 706
Less Accumulated Amortization | 571 | 407
Net Carrying Amount | 435 | 299
Patents |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 8,363 | 8,509
Less Accumulated Amortization | 4,243 | 4,118
Net Carrying Amount | 4,120 | 4,391
Customer-based intangibles |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 76,384 | 59,847
Less Accumulated Amortization | 35,209 | 29,898
Net Carrying Amount | 41,175 | 29,949
Other products and service-related intangibles |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 27,567 | 16,646
Less Accumulated Amortization | 8,859 | 6,937
Net Carrying Amount | $ 18,708 | $ 9,709

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