Document and Entity Information (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	May 31, 2014	Nov. 30, 2013	Jul. 18, 2014 Common Stock	Jul. 18, 2014 Class B Common Stock
Document Information [Line Items]
Document Type	10-K
Amendment Flag	false
Document Period End Date	May 31, 2014
Document Fiscal Year Focus	2014
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	--05-31
Entity Well-known Seasoned Issuer	No
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Accelerated Filer
Entity Public Float		$ 128.7
Entity Common Stock, Shares Outstanding			11,802,733	2,190,644