Quarterly report pursuant to Section 13 or 15(d)

Pension and Other Postretirement Benefit Plans (Details)

v3.21.2
Pension and Other Postretirement Benefit Plans (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Amortization:        
Employer contribution $ 15,000      
Fixed Income Securities        
Amortization:        
Plan assets target allocation, percentage 54.00%   54.00%  
Defined Benefit Plan, Equity Securities        
Amortization:        
Plan assets target allocation, percentage 39.00%   39.00%  
Other Investments        
Amortization:        
Plan assets target allocation, percentage 7.00%   7.00%  
Pension        
Net periodic benefit cost [Abstract]        
Service cost $ 2,020 $ 2,170 $ 6,216 $ 6,510
Interest cost * 1,560 1,933 4,654 5,799
Expected return on plan assets * (2,761) (2,232) (8,286) (6,696)
Amortization:        
Prior service cost (46) (47) (104) (141)
Net actuarial loss * 2,730 2,386 8,774 7,159
Curtailment gain * (220) 0 (220) 0
Prior service cost write-off * 526 0 526 0
Net benefit cost 3,809 4,210 11,560 12,631
Contributions during the nine months ended June 30, 2021:        
Pension     15,000  
Other Postretirement        
Net periodic benefit cost [Abstract]        
Service cost 50 64 150 192
Interest cost * 94 140 282 420
Expected return on plan assets * 0 0 0 0
Amortization:        
Prior service cost (91) (23) (273) (69)
Net actuarial loss * 0 0 0 0
Curtailment gain * 0 0 0 0
Prior service cost write-off * 0 0 0 0
Net benefit cost 53 $ 181 159 $ 543
Contributions during the nine months ended June 30, 2021:        
Other Postretirement     436  
Additional contributions expected in fiscal 2021:        
Additional contributions expected in fiscal 2021 395   395  
Supplemental retirement plan        
Contributions during the nine months ended June 30, 2021:        
Pension     607  
Additional contributions expected in fiscal 2021:        
Additional contributions expected in fiscal 2021 $ 298   $ 298