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Long-Term Debt (Narrative) (Details) - Credit Facility [Member] - USD ($)
$ in Millions
9 Months Ended
Feb. 22, 2020
Mar. 24, 2020
Debt Instrument [Line Items]    
Credit facility, maximum borrowing capacity $ 120.0  
Credit facility, expiration date Oct. 17, 2021  
Credit facility, remaining borrowing capacity $ 39.5  
Credit facility, outstanding balance $ 49.0  
Federal Funds Rate [Member]    
Debt Instrument [Line Items]    
Interest spread on variable rate 0.50%  
Eurodollar Rate [Member]    
Debt Instrument [Line Items]    
Interest spread on variable rate 1.00%  
Revolving Credit Facility [Member]    
Debt Instrument [Line Items]    
Credit facility, maximum borrowing capacity $ 90.0  
Reducing Revolving Credit Facility [Member]    
Debt Instrument [Line Items]    
Credit facility, maximum borrowing capacity 30.0  
Credit facility, remaining borrowing capacity 30.0  
Letter of Credit [Member]    
Debt Instrument [Line Items]    
Credit facility, maximum borrowing capacity 5.0  
Credit facility, outstanding balance $ 1.5  
Minimum [Member]    
Debt Instrument [Line Items]    
Credit facility, commitment fee 0.15%  
Minimum [Member] | LIBOR [Member]    
Debt Instrument [Line Items]    
Interest spread on variable rate 1.25%  
Minimum [Member] | Base Rate [Member]    
Debt Instrument [Line Items]    
Interest spread on variable rate 0.25%  
Maximum [Member]    
Debt Instrument [Line Items]    
Credit facility, commitment fee 0.25%  
Maximum [Member] | LIBOR [Member]    
Debt Instrument [Line Items]    
Interest spread on variable rate 1.50%  
Maximum [Member] | Base Rate [Member]    
Debt Instrument [Line Items]    
Interest spread on variable rate 0.50%  
Subsequent Event [Member] | Revolving Credit Facility [Member]    
Debt Instrument [Line Items]    
Credit facility, remaining borrowing capacity   $ 0.5
Subsequent Event [Member] | Reducing Revolving Credit Facility [Member]    
Debt Instrument [Line Items]    
Credit facility, remaining borrowing capacity   $ 30.0