Document and Entity Information - USD ($) $ in Millions	12 Months Ended
	May. 30, 2015	Jul. 21, 2015	Nov. 29, 2014
Document Information [Line Items]
Document Type	10-K
Amendment Flag	false
Document Period End Date	May 30, 2015
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	FY
Trading Symbol	RELL
Entity Registrant Name	RICHARDSON ELECTRONICS LTD/DE
Entity Central Index Key	0000355948
Current Fiscal Year End Date	--05-30
Entity Well-known Seasoned Issuer	No
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Accelerated Filer
Entity Public Float			$ 116.2
Common Stock
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		11,530,283
Class B Common Stock
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		2,140,644