XML 41 R31.htm IDEA: XBRL DOCUMENT v3.24.1.1.u2
RETIREMENT PLANS (Tables)
 6 Months Ended
Mar. 31, 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 March 31,
 2024202320242023
Interest cost$102,000 $101,000 $24,000 $22,000 
Expected return on plan assets(191,000)(166,000)— — 
Amortization of net actuarial gain— — (22,000)(20,000)
Net periodic benefit (income) cost$(89,000)$(65,000)$2,000 $2,000 
 Pension PlanSERP
 Six months ended March 31,
 2024202320242023
Interest cost$205,000 $203,000 $48,000 $44,000 
Expected return on plan assets(383,000)(333,000)— — 
Amortization of net actuarial gain— — (43,000)(40,000)
Net periodic benefit (income) cost$(178,000)$(130,000)$5,000 $4,000