Long-Term Debt (Narrative) (Details) - Credit Facility [Member] - USD ($) $ in Millions	12 Months Ended
	May 30, 2020	May 25, 2019
Debt Instrument [Line Items]
Credit facility, maximum borrowing capacity	$ 120.0
Credit facility, expiration date	Oct. 17, 2021
Credit facility, remaining borrowing capacity	$ 30.7
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
Credit facility, remaining borrowing capacity	0.7
Credit facility, outstanding balance	88.0	$ 43.0
Letter of Credit [Member]
Debt Instrument [Line Items]
Credit facility, maximum borrowing capacity	5.0
Credit facility, outstanding balance	1.3
Reducing Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Credit facility, maximum borrowing capacity	30.0
Credit facility, remaining borrowing capacity	$ 30.0
Minimum [Member]
Debt Instrument [Line Items]
Credit facility, commitment fee	0.15%
Credit facility, effective interest rate	2.14%
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%
Credit facility, effective interest rate	2.25%
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%