Document and Entity Information - USD ($) $ in Millions	12 Months Ended
	May 27, 2017	Jul. 24, 2017	Nov. 26, 2016
Entity Registrant Name	RICHARDSON ELECTRONICS LTD/DE
Entity Central Index Key	0000355948
Document Type	10-K
Trading Symbol	RELL
Document Period End Date	May 27, 2017
Amendment Flag	false
Current Fiscal Year End Date	--05-27
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			$ 64
Entity Common Stock, Shares Outstanding		10,712,044
Document Fiscal Period Focus	FY
Document Fiscal Year Focus	2017
Common Class B [Member]
Entity Common Stock, Shares Outstanding		2,136,919