Income Taxes - Additional Information (Details) - USD ($)	3 Months Ended		6 Months Ended
	Nov. 28, 2020	Nov. 30, 2019	Nov. 28, 2020	Nov. 30, 2019	May 30, 2020
Operating Loss Carryforwards [Line Items]
Income tax provision	$ 53,000	$ 80,000	$ 177,000	$ 257,000
Effective income tax rate			(63.00%)	(123.60%)
U.S. statutory tax rate			21.00%
Liability for uncertain tax positions related to continuing operations, excluding interest and penalties	100,000		$ 100,000		$ 100,000
Deferred tax valuation allowance	12,500,000		12,500,000		12,300,000
Maximum
Operating Loss Carryforwards [Line Items]
Deferred tax liability, undistributed earnings of foreign subsidiaries	$ 100,000		$ 100,000		$ 100,000