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RETIREMENT PLANS (Tables)
 9 Months Ended
Jun. 30, 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 June 30,
 2025202420252024
Interest cost$98,000 $103,000 $24,000 $24,000 
Expected return on plan assets(200,000)(192,000)— — 
Amortization of net actuarial gain— — — (21,000)
Net periodic benefit (income) cost$(102,000)$(89,000)$24,000 $3,000 
 Pension PlanSERP
 Nine months ended June 30,
 2025202420252024
Interest cost$293,000 $308,000 $71,000 $72,000 
Expected return on plan assets(600,000)(575,000)— — 
Amortization of net actuarial gain— — — (64,000)
Net periodic benefit (income) cost$(307,000)$(267,000)$71,000 $8,000