CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Net earnings (loss)	$ 5,554	$ (3,467)	$ 5,503	$ (5,404)
Other comprehensive income (loss):
Foreign currency translation adjustments, net of taxes of $0	(74)	(125)	(393)	(36)
Retirement plans:
Amortization of accumulated other comprehensive loss into net periodic benefit cost, net of taxes of $0	26	20	92	100
Net actuarial gains arising during the period, net of taxes of $0	0	0	0	880
Curtailment gain and gain on termination of post-retirement medical plan, net of taxes of $0	541		541	1,699
Total other comprehensive income (loss)	493	(105)	240	2,643
Total comprehensive income (loss)	6,047	(3,572)	5,743	(2,761)
Less: Comprehensive (income) loss attributable to non-controlling interests	(576)	11	(797)	20
Comprehensive income (loss) attributable to Barnwell Industries, Inc.	5,471	(3,561)	4,946	(2,741)
Pension Plan And SERP
Retirement plans:
Curtailment gain and gain on termination of post-retirement medical plan, net of taxes of $0	0	0	0	1,699
Post-retirement Medical
Retirement plans:
Curtailment gain and gain on termination of post-retirement medical plan, net of taxes of $0	$ 541	$ 0	$ 541	$ 0