CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Statement of Comprehensive Income [Abstract]
Net (loss) earnings	$ (514)	$ 1,373	$ 1,046	$ (1,488)
Other comprehensive income (loss):
Foreign currency translation adjustments, net of taxes of $0	81	(3)	33	113
Retirement plans - amortization of accumulated other comprehensive loss into net periodic benefit cost, net of taxes of $0	51	50	244	127
Total other comprehensive income	132	47	277	240
Total comprehensive (loss) income	(382)	1,420	1,323	(1,248)
Less: Comprehensive (loss) income attributable to non-controlling interests	(2)	598	532	754
Comprehensive (loss) income attributable to Barnwell Industries, Inc.	$ (380)	$ 822	$ 791	$ (2,002)