RETIREMENT PLANS (Tables)

9 Months Ended

Jun. 30, 2016

Compensation and Retirement Disclosure [Abstract]

Schedule of components of net periodic benefit cost

The following tables detail the components of net periodic benefit cost for Barnwell’s retirement plans:

	Pension Plan						SERP						Postretirement Medical
	Three months ended June 30,
	2016			2015			2016			2015			2016		2015
Service cost	$	65,000		$	64,000		$	19,000		$	15,000		$	—	$	—
Interest cost	91,000			89,000			24,000			19,000			14,000		13,000
Expected return on plan assets	(139,000		)	(125,000		)	—			—			—		—
Amortization of prior service cost (credit)	2,000			1,000			(2,000		)	(1,000		)	—		—
Amortization of net actuarial loss (gain)	38,000			21,000			12,000			6,000			—		(1,000		)
Net periodic benefit cost	$	57,000		$	50,000		$	53,000		$	39,000		$	14,000	$	12,000

	Pension Plan						SERP						Postretirement Medical
	Nine months ended June 30,
	2016			2015			2016			2015			2016		2015
Service cost	$	195,000		$	192,000		$	51,000		$	46,000		$	—	$	—
Interest cost	273,000			267,000			64,000			57,000			42,000		39,000
Expected return on plan assets	(363,000		)	(375,000		)	—			—			—		—
Amortization of prior service cost (credit)	4,000			4,000			(4,000		)	(3,000		)	—		—
Amortization of net actuarial loss (gain)	106,000			64,000			21,000			18,000			—		(4,000		)
Net periodic benefit cost	$	215,000		$	152,000		$	132,000		$	118,000		$	42,000	$	35,000