Document and Entity Information	9 Months Ended
	Feb. 28, 2015	Apr. 06, 2015
Document Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Feb. 28, 2015
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	Q3
Trading Symbol	RELL
Entity Registrant Name	RICHARDSON ELECTRONICS LTD/DE
Entity Central Index Key	0000355948
Current Fiscal Year End Date	--05-30
Entity Filer Category	Accelerated Filer
Common Stock
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		11,529,333
Class B Common Stock
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		2,140,644