Stock-Based Compensation Plans (Summary Of Impact Of Stock Based Compensation Plans) (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
May 30, 2020	May 25, 2019	May 26, 2018
Stock-Based Compensation Plans [Abstract]
Income before income taxes	$ (6,057)	$ (6,570)	$ (6,033)
Net income	$ (5,865)	$ (6,539)	$ (5,697)
Net income per share, Basic	$ (0.18)	$ (0.21)	$ (0.19)
Net income per share, Diluted	$ (0.18)	$ (0.20)	$ (0.18)

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5047-113901

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 14.F)
-URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)(i)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

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