Document and Entity Information - shares	6 Months Ended
	Apr. 30, 2017	Jun. 09, 2017
Document and Entity Information [Abstract]
Entity Registrant Name	FIRST REAL ESTATE INVESTMENT TRUST OF NEW JERSEY
Entity Central Index Key	0000036840
Document Type	10-Q
Document Fiscal Year Focus	2017
Document Fiscal Period Focus	Q2
Document Period End Date	Apr. 30, 2017
Amendment Flag	false
Current Fiscal Year End Date	--10-31
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		6,740,069