Quarterly report pursuant to Section 13 or 15(d)

Pension and Other Postretirement Benefit Plans (Details)

v3.20.4
Pension and Other Postretirement Benefit Plans (Details) - USD ($)
$ in Thousands
 3 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Pension    
Net periodic benefit cost [Abstract]    
Service cost $ 2,213 $ 2,170
Interest cost * 1,548 1,933
Expected return on plan assets * (2,763) (2,232)
Amortization:    
Prior service cost (17) (47)
Net actuarial loss * 3,021 2,387
Net benefit cost 4,002 4,211
Contributions by employer in next fiscal year 4,191  
Additional contributions expected in fiscal 2021:    
Supplemental retirement plan 4,191  
Supplemental retirement plan    
Contributions during the three months ended December 31, 2020:    
Pension 203  
Additional contributions expected in fiscal 2021:    
Supplemental retirement plan 702  
Other Postretirement    
Net periodic benefit cost [Abstract]    
Service cost 50 64
Interest cost * 94 140
Expected return on plan assets * 0 0
Amortization:    
Prior service cost (91) (23)
Net actuarial loss * 0 0
Net benefit cost 53 $ 181
Contributions during the three months ended December 31, 2020:    
Other Postretirement 23  
Additional contributions expected in fiscal 2021:    
Supplemental retirement plan $ 808