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RETIREMENT PLANS (Tables)
 6 Months Ended
Mar. 31, 2026
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,
 2026202520262025
Interest cost$102,000 $97,000 $26,000 $24,000 
Expected return on plan assets(217,000)(200,000)— — 
Amortization of net actuarial gain(13,000)— — — 
Net periodic benefit (income) cost$(128,000)$(103,000)$26,000 $24,000 
 Pension PlanSERP
 Six months ended March 31,
 2026202520262025
Interest cost$204,000 $195,000 $52,000 $47,000 
Expected return on plan assets(435,000)(400,000)— — 
Amortization of net actuarial gain(25,000)— — — 
Net periodic benefit (income) cost$(256,000)$(205,000)$52,000 $47,000