CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Statement of Comprehensive Income [Abstract]
Net (loss) earnings	$ (811)	$ 6,172
Other comprehensive (loss) income:
Foreign currency translation adjustments, net of taxes of $0	(2)	(40)
Retirement plans:
Amortization of accumulated other comprehensive gain into net periodic benefit cost, net of taxes of $0	(79)	0
Net actuarial gain arising during the period, net of taxes of $0	891	1,302
Total other comprehensive income	810	1,262
Total comprehensive (loss) income	(1)	7,434
Less: Comprehensive income attributable to non-controlling interests	(150)	(659)
Comprehensive (loss) income attributable to Barnwell Industries, Inc.	$ (151)	$ 6,775