Document And Entity Information - shares
3 Months Ended
Aug. 25, 2019
Sep. 27, 2019
Document And Entity Information [Abstract]    
Entity Registrant Name LANDEC CORP \CA\  
Entity Central Index Key 0001005286  
Current Fiscal Year End Date --05-31  
Entity Filer Category Accelerated Filer  
Entity Emerging Growth Company false  
Entity Small Business false  
Entity Common Stock, Shares Outstanding (in shares)   29,152,474
Document Type 10-Q  
Document Period End Date Aug. 25, 2019  
Document Fiscal Year Focus 2020  
Document Fiscal Period Focus Q1  
Amendment Flag false  
Entity Current Reporting Status Yes  
Entity Shell Company false