CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021
Statement of Comprehensive Income [Abstract]
Net earnings (loss)	$ 2,398	$ (794)	$ 3,738	$ (51)
Other comprehensive income (loss):
Foreign currency translation adjustments, net of taxes of $0	12	(85)	(13)	(319)
Retirement plans:
Amortization of accumulated other comprehensive loss into net periodic benefit cost, net of taxes of $0	0	33	0	66
Total other comprehensive income (loss)	12	(52)	(13)	(253)
Total comprehensive income (loss)	2,410	(846)	3,725	(304)
Less: Comprehensive income attributable to non-controlling interests	(346)	(62)	(613)	(221)
Comprehensive income (loss) attributable to Barnwell Industries, Inc.	$ 2,064	$ (908)	$ 3,112	$ (525)