CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Statement of Comprehensive Income [Abstract]
Net (loss) earnings	$ (2,151)	$ 663	$ (6,724)	$ (371)
Other comprehensive income (loss):
Foreign currency translation adjustments, net of taxes of $0	130	(181)	(283)	(187)
Retirement plans - amortization of accumulated other comprehensive loss into net periodic benefit cost, net of taxes of $0	16	39	33	63
Total other comprehensive income (loss)	146	(142)	(250)	(124)
Total comprehensive (loss) income	(2,005)	521	(6,974)	(495)
Less: Comprehensive (loss) income attributable to non-controlling interests	(26)	(16)	1	(33)
Comprehensive (loss) income attributable to Barnwell Industries, Inc.	$ (1,979)	$ 537	$ (6,975)	$ (462)