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 9 Months Ended
Jun. 30, 2022
Dec. 31, 2021
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 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 $ 4   $ 2,020 389 $ 6,216
Interest cost 48   1,560 1,086 4,654
Expected return on plan assets 0   (2,761) (1,042) (8,286)
Amortization:          
Prior service credit (66)   (46) (85) (104)
Net actuarial loss 88   2,730 380 8,774
Settlement loss       30,856 0
Curtailment gain 0   (220) 0 (220)
Prior service cost write-off 0   526 0 526
Net benefit cost 74   3,809 31,584 11,560
Contributions during the nine months ended June 30, 2022:          
Pension       35,706  
Other Postretirement          
Net periodic benefit cost [Abstract]          
Service cost 42   50 124 150
Interest cost 102   94 308 282
Expected return on plan assets 0   0 0 0
Amortization:          
Prior service credit (91)   (91) (273) (273)
Net actuarial loss 0   0 0 0
Settlement loss       0 0
Curtailment gain 0   0 0 0
Prior service cost write-off 0   0 0 0
Net benefit cost 53   $ 53 159 $ 159
Contributions during the nine months ended June 30, 2022:          
Other Postretirement       472  
Additional contributions expected in fiscal 2022:          
Additional contributions expected in fiscal 2022 412     412  
Supplemental retirement plan          
Contributions during the nine months ended June 30, 2022:          
Pension       575  
Additional contributions expected in fiscal 2022:          
Additional contributions expected in fiscal 2022 $ 185     $ 185