Document and Entity Information - shares	6 Months Ended
	Apr. 30, 2019	Jun. 07, 2019
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	2019
Document Fiscal Period Focus	Q2
Document Period End Date	Apr. 30, 2019
Amendment Flag	false
Current Fiscal Year End Date	--10-31
Entity Filer Category	Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Common Stock, Shares Outstanding		6,784,978