Quarterly report pursuant to Section 13 or 15(d)

Pension and Other Postretirement Benefit Plans (Details)

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Pension and Other Postretirement Benefit Plans (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2022
Dec. 31, 2021
Mar. 31, 2021
Mar. 31, 2022
Mar. 31, 2021
Amortization:          
Settlement loss       $ 30,856  
Employer contributions   $ 35,706      
Benefit payments   185,958      
Annuity contracts purchased   $ 56,274      
Pension          
Net periodic benefit cost [Abstract]          
Service cost $ 5   $ 1,983 385 $ 4,196
Interest cost 48   1,546 1,038 3,094
Expected return on plan assets 0   (2,762) (1,042) (5,525)
Amortization:          
Prior service credit (66)   (41) (19) (58)
Net actuarial loss 91   3,023 292 6,044
Settlement loss       30,856 0
Net benefit cost 78   3,749 31,510 7,751
Contributions during the six months ended March 31, 2022:          
Pension       35,706  
Other Postretirement          
Net periodic benefit cost [Abstract]          
Service cost 41   50 82 100
Interest cost 103   94 206 188
Expected return on plan assets 0   0 0 0
Amortization:          
Prior service credit (91)   (91) (182) (182)
Net actuarial loss 0   0 0 0
Settlement loss       0 0
Net benefit cost 53   $ 53 106 $ 106
Contributions during the six months ended March 31, 2022:          
Other Postretirement       340  
Additional contributions expected in fiscal 2022:          
Additional contributions expected in fiscal 2022 544     544  
Supplemental retirement plan          
Contributions during the six months ended March 31, 2022:          
Pension       387  
Additional contributions expected in fiscal 2022:          
Additional contributions expected in fiscal 2022 $ 373     $ 373