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Stock-Based Compensation Plans (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Nov. 28, 2020	Nov. 23, 2019	Nov. 28, 2020	Nov. 23, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 1,708	$ 1,643	$ 3,105	$ 3,158
Performance Incentive Plan 2020 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares of common stock made available for awards	1,797,440		1,797,440
Stock options vesting period			4 years
Stock options termination period			10 years
Shares available for grant	1,880,646		1,880,646
Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares of common stock made available for awards	1,825,000		1,825,000
Shares available for grant	1,396,000		1,396,000
Percentage of exercise price per share out of fair market value			85.00%
Common stock issued			245,000	215,000
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost related to stock-based compensation	$ 5,400		$ 5,400
Weighted-average period of cost to be recognized			1 year 7 months 9 days
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost related to stock-based compensation	500		$ 500
Weighted-average period of cost to be recognized			1 year 8 months 12 days
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost related to stock-based compensation	$ 6,600		$ 6,600
Weighted-average period of cost to be recognized			2 years 4 months 17 days

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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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