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Amortizable of Intangible Assets (Detail) - USD ($) $ in Thousands	May 31, 2018	May 31, 2017
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 91,704	$ 85,395
Less Accumulated Amortization	37,049	30,777
Net Carrying Amount	54,655	54,618
Licenses
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	9,491	5,989
Less Accumulated Amortization	2,523	2,011
Net Carrying Amount	6,968	3,978
Noncompete Agreements
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	801	1,208
Less Accumulated Amortization	483	309
Net Carrying Amount	318	899
Patents
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	9,693	9,304
Less Accumulated Amortization	5,013	4,601
Net Carrying Amount	4,680	4,703
Customer-based intangibles
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	56,420	56,829
Less Accumulated Amortization	24,579	20,846
Net Carrying Amount	31,841	35,983
Other products and service-related intangibles
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	15,299	12,065
Less Accumulated Amortization	4,451	3,010
Net Carrying Amount	$ 10,848	$ 9,055

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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
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