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Pension and Other Postretirement Benefit Plans (Tables)
 9 Months Ended
Jun. 30, 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 June 30,
 PensionOther Postretirement
 2024202320242023
Service cost$30 $31 $14 $19 
Interest cost *130 106 171 161 
Amortization:    
Prior service credit— — (91)(92)
Net actuarial gains *(13)(5)(180)(177)
Net benefit cost$147 $132 $(86)$(89)

 Nine months ended June 30,
 PensionOther Postretirement
 2024202320242023
Service cost$91 $119 $41 $57 
Interest cost *388 354 513 483 
Amortization:    
Prior service credit— — (273)(274)
Net actuarial gains *(33)(21)(541)(531)
Settlement losses *— 1,271 — — 
Net benefit cost$446 $1,723 $(260)$(265)
* Non-service components of pension and postretirement expense are included in other income (deductions), net.