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Summary Of Significant Accounting Policies (Narrative) (Details) - USD ($)
$ in Thousands
Feb. 22, 2020
May 25, 2019
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term investments   $ 5,981
Level 3 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Contingent consideration liability $ 7,800 2,200
Level 2 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term investments   $ 6,000