RETIREMENT PLANS (Tables)

9 Months Ended

Jun. 30, 2015

Compensation and Retirement Disclosure [Abstract]

Schedule of components of net periodic benefit cost

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

	Pension Plan						SERP						Postretirement Medical
	Three months ended June 30,
	2015			2014			2015			2014			2015			2014
Service cost	$	64,000		$	—		$	15,000		$	12,000		$	—		$	3,000
Interest cost	89,000			73,000			19,000			17,000			13,000			13,000
Expected return on plan assets	(125,000		)	(113,000		)	—			—			—			—
Amortization of prior service cost (credit)	1,000			1,000			(1,000		)	(1,000		)	—			3,000
Amortization of net actuarial loss (gain)	21,000			(3,000		)	6,000			2,000			(1,000		)	(5,000		)
Net periodic benefit cost	$	50,000		$	(42,000	)	$	39,000		$	30,000		$	12,000		$	14,000

	Pension Plan						SERP						Postretirement Medical
	Nine months ended June 30,
	2015			2014			2015			2014			2015			2014
Service cost	$	192,000		$	118,000		$	46,000		$	35,000		$	—		$	9,000
Interest cost	267,000			242,000			57,000			50,000			39,000			40,000
Expected return on plan assets	(375,000		)	(323,000		)	—			—			—			—
Amortization of prior service cost (credit)	4,000			4,000			(3,000		)	(4,000		)	—			9,000
Amortization of net actuarial loss (gain)	64,000			15,000			18,000			4,000			(4,000		)	(15,000		)
Net periodic benefit cost	$	152,000		$	56,000		$	118,000		$	85,000		$	35,000		$	43,000