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Income Taxes - Additional Information (Detail) - USD ($) |  | 12 Months Ended
--- | --- | ---
Dec. 22, 2017 | May 31, 2020 | May 31, 2019 | May 31, 2018
Income Taxes [Line Items] |  |  |  |
Decreased income tax expense |  | $ 2,000,000.0 | $ 2,600,000 | $ 4,800,000
Federal corporate tax rate | 35.00% | 21.00% | 21.00% | 21.00%
Current tax expense |  |  |  | $ 1,223,000
Net benefit |  | $ 4,800,000 |  |
Foreign tax credits |  | 945,000 | $ 1,296,000 | 791,000
Research and development credit |  | $ 472,000 | $ 430,000 | 422,000
Deferred tax assets and liabilities |  |  |  | 6,000,000.0
GILTI [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Income tax expense |  |  |  | 840,000
Tax benefit |  |  |  | $ 1,500,000

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- Definition Amount, after allocation of valuation allowances and deferred tax liability, of deferred tax asset attributable to deductible differences and carryforwards, without jurisdictional netting. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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