CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Statement of Comprehensive Income [Abstract]
Net loss	$ (1,398)	$ (94)	$ (8,122)	$ (465)
Other comprehensive (loss) income:
Foreign currency translation adjustments, net of taxes of $0	89	(76)	(194)	(263)
Retirement plans - amortization of accumulated other comprehensive loss into net periodic benefit cost, net of taxes of $0	9	30	42	93
Total other comprehensive (loss) income	98	(46)	(152)	(170)
Total comprehensive loss	(1,300)	(140)	(8,274)	(635)
Less: Comprehensive (loss) income attributable to non-controlling interests	(33)	280	(32)	247
Comprehensive loss attributable to Barnwell Industries, Inc.	$ (1,267)	$ (420)	$ (8,242)	$ (882)