Document and Entity Information - shares	9 Months Ended
	Feb. 29, 2020	Apr. 07, 2020
Document Information [Line Items]
Entity Registrant Name	RICHARDSON ELECTRONICS LTD/DE
Entity Central Index Key	0000355948
Document Type	10-Q
Trading Symbol	RELL
Document Period End Date	Feb. 29, 2020
Amendment Flag	false
Current Fiscal Year End Date	--05-30
Entity's Reporting Status Current	Yes
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Small Business	true
Entity Filer Category	Accelerated Filer
Document Fiscal Period Focus	Q3
Document Fiscal Year Focus	2020
Entity File Number	0-12906
Entity Tax Identification Number	36-2096643
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	IL
Entity Address, Postal Zip Code	60147-0393
City Area Code	630
Local Phone Number	208-2200
Entity Incorporation, State or Country Code	DE
Document Quarterly Report	true
Document Transition Report	false
Entity Interactive Data Current	Yes
Title of 12(b) Security	Common stock, $0.05 Par Value
Security Exchange Name	NASDAQ
Common Stock
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		11,038,235
Common Class B
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		2,096,919