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Amortizable of Intangible Assets (Detail) - USD ($) $ in Thousands | May 31, 2022 | May 31, 2021
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Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 147,522 | $ 130,233
Less Accumulated Amortization | 55,416 | 53,462
Net Carrying Amount | 92,106 | 76,771
Licenses |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 17,109 | 16,913
Less Accumulated Amortization | 5,682 | 4,580
Net Carrying Amount | 11,427 | 12,333
Noncompete Agreements |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 846 | 1,006
Less Accumulated Amortization | 671 | 571
Net Carrying Amount | 175 | 435
Patents |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 8,347 | 8,363
Less Accumulated Amortization | 4,583 | 4,243
Net Carrying Amount | 3,764 | 4,120
Customer-based intangibles |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 75,000 | 76,384
Less Accumulated Amortization | 33,662 | 35,209
Net Carrying Amount | 41,338 | 41,175
Other products and service-related intangibles |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 46,220 | 27,567
Less Accumulated Amortization | 10,818 | 8,859
Net Carrying Amount | $ 35,402 | $ 18,708

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