Document and Entity Information - shares	6 Months Ended
	Apr. 30, 2018	Jun. 08, 2018
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	2018
Document Fiscal Period Focus	Q2
Document Period End Date	Apr. 30, 2018
Amendment Flag	false
Current Fiscal Year End Date	--10-31
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		6,755,875