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Commitments And Contingencies (Narrative) (Details)
12 Months Ended
May 25, 2019
USD ($)
ft²
May 26, 2018
USD ($)
May 27, 2017
USD ($)
Property Subject to or Available for Operating Lease [Line Items]      
Capital leases $ 0    
Rent expense $ 15,500,000 $ 13,700,000 $ 12,900,000
Area of real estate property | ft² 57,000    
Rental income $ 240,000 $ 305,000 $ 332,000
Expected rental income from third party leases in 2020 414,000    
Expected rental income from third party leases in 2021 368,000    
Expected rental income from third party leases in 2022 306,000    
Expected rental income from third party leases in 2023 226,000    
Expected rental income from third party leases in 2024 232,000    
Expected rental income from third party leases after 2024 $ 78,000    
Leases To Independent Third Parties [Member]      
Property Subject to or Available for Operating Lease [Line Items]      
Area of real estate property | ft² 13,000