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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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