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Goodwill and Other Intangible Assets - Additional Information (Detail) - USD ($) | 12 Months Ended
--- | ---
May 31, 2019 | May 31, 2018 | May 31, 2016
Other non-amortizable intangible assets | $ 15,649,000 | $ 14,938,000 |
Amortization expense for intangible assets | 6,309,000 | $ 6,743,000 | $ 5,908,000
Estimated amortization expense for period, 2020 | 6,664,000 |  |
Estimated amortization expense for period, 2021 | 6,025,000 |  |
Estimated amortization expense for period, 2022 | 5,673,000 |  |
Estimated amortization expense for period, 2023 | 5,299,000 |  |
Estimated amortization expense for period, 2024 | $ 4,989,000 |  |
Finite lived intangible assets, useful life | 10 years | 11 years |
Maximum |  |  |
Finite lived intangible assets, useful life | 25 years |  |
Minimum |  |  |
Finite lived intangible assets, useful life | 5 years |  |
Licenses |  |  |
Other non-amortizable intangible assets | $ 569,000 | $ 569,000 |
Licenses | Maximum |  |  |
Finite lived intangible assets, useful life | 20 years |  |
Licenses | Minimum |  |  |
Finite lived intangible assets, useful life | 2 years |  |
Trademarks |  |  |
Other non-amortizable intangible assets | $ 13,717,000 | 12,989,000 |
Other Intangible Assets |  |  |
Other non-amortizable intangible assets | $ 1,363,000 | $ 1,380,000 |
Noncompete Agreements | Maximum |  |  |
Finite lived intangible assets, useful life | 13 years |  |
Noncompete Agreements | Minimum |  |  |
Finite lived intangible assets, useful life | 5 years |  |
Patents | Maximum |  |  |
Finite lived intangible assets, useful life | 25 years |  |
Patents | Minimum |  |  |
Finite lived intangible assets, useful life | 5 years |  |
Customer-based intangibles | Maximum |  |  |
Finite lived intangible assets, useful life | 20 years |  |
Customer-based intangibles | Minimum |  |  |
Finite lived intangible assets, useful life | 5 years |  |
Other products and service-related intangibles | Maximum |  |  |
Finite lived intangible assets, useful life | 20 years |  |
Other products and service-related intangibles | Minimum |  |  |
Finite lived intangible assets, useful life | 5 years |  |

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + Details
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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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