Document and Entity Information (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Jun. 02, 2012	Dec. 03, 2011	Jul. 23, 2012 Common Stock	Jul. 23, 2012 Class B Common Stock
Entity Registrant Name	RICHARDSON ELECTRONICS LTD/DE
Entity Central Index Key	0000355948
Document Type	10-K
Document Period End Date	Jun. 02, 2012
Amendment Flag	false
Document Fiscal Year Focus	2012
Current Fiscal Year End Date	--06-02
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Document Fiscal Period Focus	FY
Entity Filer Category	Accelerated Filer
Entity Public Float		$ 167.2
Entity Common Stock, Shares Outstanding			12,742,748	2,919,961