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RETIREMENT PLANS (Tables)
 9 Months Ended
Jun. 30, 2024
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 PlanSERP
 Three months ended June 30,
 2024202320242023
Interest cost$103,000 $102,000 $24,000 $22,000 
Expected return on plan assets(192,000)(167,000)— — 
Amortization of net actuarial gain— — (21,000)(20,000)
Net periodic benefit (income) cost$(89,000)$(65,000)$3,000 $2,000 
 Pension PlanSERP
 Nine months ended June 30,
 2024202320242023
Interest cost$308,000 $305,000 $72,000 $66,000 
Expected return on plan assets(575,000)(500,000)— — 
Amortization of net actuarial gain— — (64,000)(60,000)
Net periodic benefit (income) cost$(267,000)$(195,000)$8,000 $6,000