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Amortizable of Intangible Assets (Detail) - USD ($) $ in Thousands	May 31, 2020	May 31, 2019
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

X

- Definition

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

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Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 926
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