CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Statement of Comprehensive Income [Abstract]
Net loss	$ (4,573)	$ (1,034)
Other comprehensive (loss) income:
Foreign currency translation adjustments, net of taxes of $0	(413)	(6)
Retirement plans - amortization of accumulated other comprehensive loss into net periodic benefit cost, net of taxes of $0	17	24
Total other comprehensive (loss) income	(396)	18
Total comprehensive loss	(4,969)	(1,016)
Less: Comprehensive income (loss) attributable to non-controlling interests	27	(17)
Comprehensive loss attributable to Barnwell Industries, Inc.	$ (4,996)	$ (999)