Quarterly report pursuant to Section 13 or 15(d)

Pension and Other Postretirement Benefit Plans - Net Periodic Pension and Other Postretirement Benefit Cost (Details)

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Pension and Other Postretirement Benefit Plans - Net Periodic Pension and Other Postretirement Benefit Cost (Details) - USD ($)
$ in Thousands
 3 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Amortization:    
Settlement losses $ 0 $ (24,242)
Pension    
Net periodic benefit cost [Abstract]    
Service cost 30 57
Interest cost 129 143
Amortization:    
Prior service credit 0 0
Net actuarial gain (11) (10)
Settlement losses 0 1,271
Net benefit cost 148 1,461
Other Postretirement    
Net periodic benefit cost [Abstract]    
Service cost 14 19
Interest cost 171 161
Amortization:    
Prior service credit (91) (91)
Net actuarial gain (180) (177)
Settlement losses 0 0
Net benefit cost $ (86) $ (88)