Document And Entity Information (USD $) In Millions, except Share data	9 Months Ended
	Jul. 31, 2011	Sep. 09, 2011	Apr. 30, 2010
Entity Registrant Name	FIRST REAL ESTATE INVESTMENT TRUST OF NEW JERSEY
Entity Central Index Key	0000036840
Current Fiscal Year End Date	--10-31
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Accelerated Filer
Entity Public Float			$ 79
Entity Common Stock, Shares Outstanding		6,942,143
Document Fiscal Year Focus	2011
Document Fiscal Period Focus	Q3
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jul. 31, 2011