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Income Taxes - Additional Information (Details) - USD ($)	3 Months Ended		9 Months Ended
	Feb. 27, 2021	Feb. 29, 2020	Feb. 27, 2021	Feb. 29, 2020	May 30, 2020
Operating Loss Carryforwards [Line Items]
Income tax provision	$ 62,000	$ 181,000	$ 239,000	$ 438,000
U.S. tax benefit			0
Liability for uncertain tax positions related to continuing operations, excluding interest and penalties	100,000		100,000		$ 100,000
Deferred tax valuation allowance	12,400,000		12,400,000		12,300,000
Maximum
Operating Loss Carryforwards [Line Items]
Deferred tax liability, undistributed earnings of foreign subsidiaries	$ 100,000		$ 100,000		$ 100,000

X

- Definition

Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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Amount of deferred tax liability attributable to taxable temporary differences from undistributed earnings of subsidiary and other recognized entity not within country of domicile. Includes, but is not limited to, other basis differences.

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Amount of current and deferred federal income tax expense (benefit) attributable to income (loss) from continuing operations.

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Amount recognized for uncertainty in income taxes classified as noncurrent.

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