Document and Entity Information - USD ($) $ in Millions	12 Months Ended
	Jun. 01, 2019	Jul. 22, 2019	Dec. 01, 2018
Document Information [Line Items]
Entity Registrant Name	RICHARDSON ELECTRONICS LTD/DE
Entity Central Index Key	0000355948
Document Type	10-K
Trading Symbol	RELL
Document Period End Date	Jun. 01, 2019
Amendment Flag	false
Current Fiscal Year End Date	--06-01
Entity a Well-known Seasoned Issuer	No
Entity a Voluntary Filer	No
Entity's Reporting Status Current	Yes
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Small Business	true
Entity Filer Category	Accelerated Filer
Entity Public Float			$ 77.7
Document Fiscal Period Focus	FY
Document Fiscal Year Focus	2019
Entity File Number	0-12906
Entity Tax Identification Number	362096643
Entity Address, Address Line One	40W267 Keslinger Road
Entity Address, Address Line Two	P.O. Box 393
Entity Address, City or Town	LaFox
Entity Address State Or Province	Illinois
Entity Address, Postal Zip Code	60147-0393
City Area Code	630
Local Phone Number	208-2200
Common Stock
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		10,956,852
Common Class B
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		2,096,919