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RETIREMENT PLANS (Tables)
 6 Months Ended
Mar. 31, 2025
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 March 31,
 2025202420252024
Interest cost$97,000 $102,000 $24,000 $24,000 
Expected return on plan assets(200,000)(191,000)— — 
Amortization of net actuarial gain— — — (22,000)
Net periodic benefit (income) cost$(103,000)$(89,000)$24,000 $2,000 
 Pension PlanSERP
 Six months ended March 31,
 2025202420252024
Interest cost$195,000 $205,000 $47,000 $48,000 
Expected return on plan assets(400,000)(383,000)— — 
Amortization of net actuarial gain— — — (43,000)
Net periodic benefit (income) cost$(205,000)$(178,000)$47,000 $5,000