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Document And Entity Information
 9 Months Ended
Mar. 03, 2012
Apr. 09, 2012
Common Stock [Member]
Apr. 09, 2012
Class B Common Stock [Member]
Document Type 10-Q    
Amendment Flag false    
Document Period End Date Mar. 03, 2012    
Entity Registrant Name RICHARDSON ELECTRONICS LTD/DE    
Entity Central Index Key 0000355948    
Current Fiscal Year End Date --06-02    
Document Fiscal Period Focus Q3    
Document Fiscal Year Focus 2012    
Entity Filer Category Accelerated Filer    
Entity Common Stock, Shares Outstanding   13,802,486 2,939,961