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RETIREMENT PLANS (Tables)
 9 Months Ended
Jun. 30, 2022
Retirement Benefits [Abstract]  
Schedule of components of net periodic benefit cost (income)
The following tables detail the components of net periodic benefit (income) cost for Barnwell’s retirement plans:
 Pension PlanSERPPost-retirement Medical
 Three months ended June 30,
 202220212022202120222021
Interest cost$73,000 $64,000 $15,000 $13,000 $— $12,000 
Expected return on plan assets(156,000)(136,000)— — — — 
Amortization of net actuarial loss— 10,000 — — — 16,000 
Net periodic benefit (income) cost$(83,000)$(62,000)$15,000 $13,000 $— $28,000 
 Pension PlanSERPPost-retirement Medical
 Nine months ended June 30,
 202220212022202120222021
Interest cost$218,000 $193,000 $45,000 $39,000 $— $48,000 
Expected return on plan assets(467,000)(410,000)— — — — 
Amortization of net actuarial loss — 30,000 — — — 62,000 
Net periodic benefit (income) cost$(249,000)$(187,000)$45,000 $39,000 $— $110,000