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Document And Entity Information - USD ($)
$ in Thousands
 12 Months Ended
May. 31, 2015
Jul. 17, 2015
Nov. 30, 2014
Entity Registrant Name LANDEC CORP \CA\    
Entity Central Index Key 0001005286    
Current Fiscal Year End Date --05-31    
Entity Filer Category Accelerated Filer    
Entity Current Reporting Status Yes    
Entity Voluntary Filers No    
Entity Well-known Seasoned Issuer No    
Entity Common Stock, Shares Outstanding (in shares)   27,009,342  
Entity Public Float     $ 344,754
Document Type 10-K    
Document Period End Date May 31, 2015    
Document Fiscal Year Focus 2015    
Document Fiscal Period Focus FY    
Amendment Flag false