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, 2022
Dec. 31, 2021
Amortization:    
Settlement losses $ (24,242) $ (35,706)
Pension    
Net periodic benefit cost [Abstract]    
Service cost 57 380
Interest cost 143 990
Expected return on plan assets 0 (1,042)
Amortization:    
Prior service credit 0 47
Net actuarial loss (10) 201
Settlement losses 1,271 30,856
Net benefit cost 1,461 31,432
Other Postretirement    
Net periodic benefit cost [Abstract]    
Service cost 19 41
Interest cost 161 103
Expected return on plan assets 0 0
Amortization:    
Prior service credit (91) (91)
Net actuarial loss (177) 0
Settlement losses 0 0
Net benefit cost $ (88) $ 53