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Leases (Narrative) (Details)
12 Months Ended
May 28, 2022
USD ($)
ft²
May 29, 2021
USD ($)
May 30, 2020
USD ($)
Lessee, Lease, Description [Line Items]      
Rental income $ 199,000 $ 162,000 $ 210,000
Expected rental income from third party leases in fiscal 2023 219,000    
Expected rental income from third party leases in fiscal 2024 219,000    
Expected rental income from third party leases in fiscal 2025 $ 77,000    
California [Member]      
Lessee, Lease, Description [Line Items]      
Area of real estate property | ft² 57,000    
Leases To Independent Third Parties [Member] | California [Member]      
Lessee, Lease, Description [Line Items]      
Area of real estate property | ft² 13,000