Quarterly report pursuant to Section 13 or 15(d)

Pension and Other Postretirement Benefit Plans (Details)

v3.20.2
Pension and Other Postretirement Benefit Plans (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Common Stock Class A        
Amortization:        
Value of employee benefit plan     $ 15,000  
Pension        
Net periodic benefit cost [Abstract]        
Service cost $ 2,170 $ 2,000 6,510 $ 6,000
Interest cost * 1,933 2,301 5,799 6,903
Expected return on plan assets * (2,232) (2,596) (6,696) (7,788)
Amortization:        
Prior service cost (47) (46) (141) (138)
Net actuarial loss (gain) * 2,386 1,081 7,159 3,242
Net benefit cost 4,210 2,740 12,631 8,219
Additional contributions expected in fiscal 2020:        
Supplemental retirement plan 15,000   15,000  
Supplemental retirement plan        
Contributions during the nine months ended June 30, 2020:        
Pension     589  
Additional contributions expected in fiscal 2020:        
Supplemental retirement plan 293   293  
Other Postretirement        
Net periodic benefit cost [Abstract]        
Service cost 64 61 192 183
Interest cost * 140 180 420 540
Expected return on plan assets * 0 0 0 0
Amortization:        
Prior service cost (23) (49) (69) (147)
Net actuarial loss (gain) * 0 (15) 0 (45)
Net benefit cost 181 $ 177 543 $ 531
Contributions during the nine months ended June 30, 2020:        
Other Postretirement     726  
Additional contributions expected in fiscal 2020:        
Supplemental retirement plan $ 263   $ 263