Segment information (Details) $ in Thousands	3 Months Ended										12 Months Ended
	Oct. 31, 2021 USD ($) properties		Jul. 31, 2021 USD ($)	Apr. 30, 2021 USD ($)	Jan. 31, 2021 USD ($)	Oct. 31, 2020 USD ($) properties	Jul. 31, 2020 USD ($)		Apr. 30, 2020 USD ($)	Jan. 31, 2020 USD ($)	Oct. 31, 2021 USD ($) segments properties	Oct. 31, 2020 USD ($) properties	Oct. 31, 2019 USD ($) properties
Reportable Segments
Real estate rental revenue	$ 12,191	[1]	$ 12,542	$ 12,804	$ 12,754	$ 11,297	$ 12,149	[2]	$ 13,688	$ 15,593	$ 50,291	$ 52,727	$ 60,277
Real estate operating expenses											36,789	48,967	41,450
Operating income											13,502	3,760	18,827
Reconciliation to consolidated net income attributable to common equity:
Deferred rents - straight lining											(230)	(397)	410
Investment income											116	204	360
Unrealized (loss) gain on interest rate cap contract													(160)
Special Committee third party advisory, legal and other expenses												(4,606)	(1,416)
Gain on sale of property													836
Gain on deconsolidation of subsidiary												27,680
Loss on investment in tenancy-in-common											(295)	(202)
General and administrative expenses											(5,195)	(3,821)	(2,633)
Depreciation											(9,300)	(10,341)	(11,339)
Tenant improvement write-off due to COVID-19												(7,277)
Financing costs											(12,276)	(14,122)	(18,070)
Net income	15		316	(63)	779	(7,475)	(320)		27,136	(2,021)	1,047	17,320	1,793
Net (income) loss attributable to noncontrolling interests in subsidiaries	136		(107)	72	(221)	3,251	139		84	(241)	(120)	3,233	(6)
Net income attributable to common equity	$ 151		$ 209	$ 9	$ 558	$ (4,224)	$ (181)		$ 27,220	$ (2,262)	$ 927	20,553	1,787
Number of reportable segments | segments											2
Operating Segments [Member]
Reportable Segments
Real estate rental revenue											$ 50,521	53,124	59,867
Real estate operating expenses											22,294	22,922	26,062
Operating income											28,227	30,202	33,805
Reconciliation to consolidated net income attributable to common equity:
Segment NOI											$ 28,227	$ 30,202	$ 33,805
Commercial [Member]
Reconciliation to consolidated net income attributable to common equity:
Number of properties | properties	8					8					8	8	8
Commercial [Member] | Operating Segments [Member]
Reportable Segments
Real estate rental revenue											$ 23,547	$ 24,486	$ 26,692
Real estate operating expenses											11,223	11,334	11,694
Operating income											12,324	13,152	14,998
Residential [Member]
Reportable Segments
Recurring capital improvements - residential											$ (625)	$ (347)	$ (685)
Reconciliation to consolidated net income attributable to common equity:
Number of properties | properties	7					7					7	7	8
Residential [Member] | Operating Segments [Member]
Reportable Segments
Real estate rental revenue											$ 26,974	$ 28,638	$ 33,175
Real estate operating expenses											11,071	11,588	14,368
Operating income											$ 15,903	$ 17,050	$ 18,807

[1] Includes settle-ups of Common Area Maintenance with commercial tenants of approximately $0.7 million for the fiscal quarter ended October 31, 2021, of which approximately $0.4 million related to Fiscal 2020 and approximately $0.3 million related to prior quarters in Fiscal 2021.

[2] Includes impact of the rejection of the lease for Cobb Theatre at the Rotunda retail property as of June 30, 2020 resulting in the reversal against revenue of uncollected rents in the amount of approximately $0.3 million and a straight-line rent receivable of approximately $0.4 million and the write-off of unamortized leasing commissions in the amount of approximately $0.2 million resulting in a net impact of approximately $0.9 million (with a consolidated impact to FREIT of approximately $0.5 million). ($0.07 per share)