CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Net earnings (loss)	$ 7,203	$ (4,677)
Other comprehensive income (loss):
Foreign currency translation adjustments, net of taxes of $0	(283)	(146)
Retirement plans:
Amortization of accumulated other comprehensive loss into net periodic benefit cost, net of taxes of $0	101	120
Net actuarial gain (loss) arising during the period, net of taxes of $0	1,108	(218)
Curtailment gain and gain on termination of post-retirement medical plan, net of taxes of $0	541	1,726
Total other comprehensive income	1,467	1,482
Total comprehensive income (loss)	8,670	(3,195)
Less: Comprehensive income attributable to non-controlling interests	(950)	(79)
Comprehensive income (loss) attributable to Barnwell Industries, Inc.	7,720	(3,274)
Pension Plan And Supplemental Employee Retirement Plan
Retirement plans:
Curtailment gain and gain on termination of post-retirement medical plan, net of taxes of $0	0	1,726
Post-retirement Medical
Retirement plans:
Curtailment gain and gain on termination of post-retirement medical plan, net of taxes of $0	$ 541	$ 0