CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2023	Mar. 31, 2022
Statement of Comprehensive Income [Abstract]
Net (loss) earnings	$ (1,235)	$ 2,398	$ (26)	$ 3,738
Other comprehensive (loss) income:
Foreign currency translation adjustments, net of taxes of $0	0	12	2	(13)
Retirement plans:
Amortization of accumulated other comprehensive gain into net periodic benefit cost, net of taxes of $0	(20)	0	(40)	0
Total other comprehensive (loss) income	(20)	12	(38)	(13)
Total comprehensive (loss) income	(1,255)	2,410	(64)	3,725
Less: Comprehensive income attributable to non-controlling interests	(2)	(346)	(122)	(613)
Comprehensive (loss) income attributable to Barnwell Industries, Inc.	$ (1,257)	$ 2,064	$ (186)	$ 3,112