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Leases (Narrative) (Details)
3 Months Ended 6 Months Ended
Nov. 28, 2020
USD ($)
ft²
Nov. 23, 2019
USD ($)
Nov. 28, 2020
USD ($)
ft²
Nov. 23, 2019
USD ($)
Area of real estate property | ft² 57,000   57,000  
Rental income $ 55,000 $ 70,000 $ 110,000 $ 106,000
Expected rental income from third party leases in fiscal 2021 107,000   107,000  
Expected rental income from third party leases in fiscal 2022 219,000   219,000  
Expected rental income from third party leases in fiscal 2023 226,000   226,000  
Expected rental income from third party leases in fiscal 2024 232,000   232,000  
Expected rental income from third party leases in fiscal 2025 $ 78,000   $ 78,000  
Leases To Independent Third Parties [Member]        
Area of real estate property | ft² 13,000   13,000