CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Statement of Comprehensive Income [Abstract]
Net loss	$ (12,417)	$ (1,418)
Other comprehensive (loss) income:
Foreign currency translation adjustments, net of taxes of $0	(234)	(128)
Amortization of net actuarial loss and prior service cost	55	124
Retirement plans:
Amortization of accumulated other comprehensive loss into net periodic benefit cost, net of taxes of $0	55	124
Net actuarial (loss) gains arising during the period, net of taxes of $0	(2,224)	548
Total other comprehensive (loss) income	(2,403)	544
Total comprehensive loss	(14,820)	(874)
Less: Comprehensive (loss) income attributable to non-controlling interests	(3)	352
Comprehensive loss attributable to Barnwell Industries, Inc.	$ (14,817)	$ (1,226)