Document and Entity Information	9 Months Ended
	Feb. 28, 2015	Apr. 07, 2015
Document And Entity Information [Abstract]
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	ELRC
Entity Registrant Name	ELECTRO RENT CORP
Entity Central Index Key	0000032166
Current Fiscal Year End Date	--05-31
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		24,105,396