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Document and Entity Information - USD ($)
$ in Thousands
 12 Months Ended
May 28, 2016
Jul. 25, 2016
Nov. 28, 2015
Entity Registrant Name RICHARDSON ELECTRONICS LTD/DE    
Entity Central Index Key 0000355948    
Document Type 10-K    
Trading Symbol RELL    
Document Period End Date May 28, 2016    
Amendment Flag false    
Current Fiscal Year End Date --05-28    
Entity a Well-known Seasoned Issuer No    
Entity a Voluntary Filer No    
Entity's Reporting Status Current Yes    
Entity Filer Category Accelerated Filer    
Entity Public Float     $ 61,000
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2016    
Common Stock [Member]      
Entity Common Stock, Shares Outstanding   10,702,932  
Common Class B [Member]      
Entity Common Stock, Shares Outstanding   2,140,631