Document And Entity Information	3 Months Ended
	Sep. 03, 2011	Sep. 30, 2011 Common Stock [Member]	Sep. 30, 2011 Class B Common Stock [Member]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 03, 2011
Entity Registrant Name	RICHARDSON ELECTRONICS LTD/DE
Entity Central Index Key	0000355948
Current Fiscal Year End Date	--06-02
Document Fiscal Period Focus	Q1
Document Fiscal Year Focus	2012
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		14,070,480	2,939,961