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Amortizable of Intangible Assets (Detail) - USD ($) $ in Thousands	May 31, 2019	May 31, 2018
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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Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
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