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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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New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Income Tax Expense (Benefit)

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Represents Tax Cuts And Jobs Act Of 2017 Adjustment to income tax Expense.

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Tax Cuts and Jobs Act of 2017 change in tax rate deferred income tax expense benefit net.

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Amount, after allocation of valuation allowances and deferred tax liability, of deferred tax asset attributable to deductible differences and carryforwards, without jurisdictional netting.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to foreign tax credit.

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