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Income Taxes - Additional Information (Detail) - USD ($) |  | 12 Months Ended
--- | --- | ---
Dec. 22, 2017 | May 31, 2019 | May 31, 2018 | May 31, 2017
Income Taxes [Line Items] |  |  |  |
Decreased income tax expense |  | $ 2,600,000 | $ 4,800,000 |
Federal corporate tax rate | 35.00% | 21.00% | 21.00% |
Current tax expense |  |  | $ 1,223,000 |
Net benefit |  | $ 4,800,000 |  |
Foreign tax credits |  | 1,296,000 | 791,000 | $ 729,000
Research and development credit |  | $ 430,000 | 422,000 | $ 422,000
Deferred tax assets and liabilities |  |  | 6,000,000 |
GILTI [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Income tax expense |  |  | 840,000 |
Tax benefit |  |  | $ 1,500,000 |

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