Selected quarterly financial data (unaudited) (Details) - USD ($)		3 Months Ended									9 Months Ended	12 Months Ended
	Sep. 09, 2022	Oct. 31, 2022	[1]	Jul. 31, 2022	Apr. 30, 2022	[2]	Jan. 31, 2022	Oct. 31, 2021	Jul. 31, 2021	Jan. 31, 2021	Jul. 31, 2021	Oct. 31, 2022	Oct. 31, 2021	Oct. 31, 2020
Selected quarterly financial data (unaudited) (Details) [Line Items]
Gain from sales												$ 70,000,000	$ 1,200,000
Income (loss) from discontinued operations												$ 46,300,000
Earnings per share basic	$ 0.17	$ (0.08)		$ 0.16	$ (0.05)		$ 6.51	$ 0.02	$ 0.03	$ 0.08		$ 6.52	$ 0.13	$ 2.94
Earnings per share diluted	$ 0.17	$ (0.08)		$ 0.16	$ (0.05)		$ 6.45					$ 6.45	0.13	$ 2.94
Increase in expenses of compensation cost												$ 1,200,000
Settle-ups of Common Area Maintenance with commercial tenants											$ 300,000	$ 700,000		$ 400,000
Maryland Properties [Member]
Selected quarterly financial data (unaudited) (Details) [Line Items]
Earnings per share basic												$ 6.58	700,000
Earnings per share diluted												$ 6.52	$ 0.1
Wayne PSC [Member]
Selected quarterly financial data (unaudited) (Details) [Line Items]
Gain from sales												$ 1,400
Earnings per share basic												$ 0.6
Earnings per share diluted												$ 0.08

[1] Includes stock compensation expense of approximately $1.2 million for the incremental compensation cost attributed to the revaluation of the stock options modified on September 9, 2022 ($0.17 per share basic and diluted).

[2] Includes $1.2 million reduction in gain on sale of the Maryland properties with a consolidated impact to FREIT of approximately $0.7 million ($0.10 per share basic and diluted).