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Pension and Other Postretirement Benefit Plans (Tables)
 6 Months Ended
Mar. 31, 2024
Retirement Benefits [Abstract]  
Net Periodic Pension and Other Postretirement Benefit Cost Net periodic pension and other postretirement benefit cost for the plans included the following:
 Three months ended March 31,
 PensionOther Postretirement
 2024202320242023
Service cost$31 $31 $13 $19 
Interest cost *129 105 171 161 
Amortization:    
Prior service credit— — (91)(91)
Net actuarial gains *(9)(6)(181)(177)
Net benefit cost$151 $130 $(88)$(88)

 Six months ended March 31,
 PensionOther Postretirement
 2024202320242023
Service cost$61 $88 $27 $38 
Interest cost *258 248 342 322 
Amortization:    
Prior service credit— — (182)(182)
Net actuarial gains *(20)(16)(361)(354)
Settlement losses *— 1,271 — — 
Net benefit cost$299 $1,591 $(174)$(176)
* Non-service components of pension and postretirement expense are included in other income (deductions), net.