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
Dec. 31, 2019
Dec. 31, 2018
Pension    
Net periodic benefit cost [Abstract]    
Service cost $ 2,170 $ 2,000
Interest cost 1,933 2,301
Expected return on plan assets (2,232) (2,596)
Amortization:    
Prior service cost (47) (46)
Net actuarial loss (gain) 2,387 1,061
Net benefit cost 4,211 2,720
Required contributions by employer in next fiscal year 4,333  
Additional contributions expected in fiscal 2020:    
Supplemental retirement plan 4,333  
Supplemental retirement plan    
Contributions during the three months ended December 31, 2019:    
Pension 176  
Additional contributions expected in fiscal 2020:    
Supplemental retirement plan 706  
Other Postretirement    
Net periodic benefit cost [Abstract]    
Service cost 64 61
Interest cost 140 180
Expected return on plan assets 0 0
Amortization:    
Prior service cost (23) (49)
Net actuarial loss (gain) 0 (15)
Net benefit cost 181 $ 177
Contributions during the three months ended December 31, 2019:    
Other Postretirement 206  
Additional contributions expected in fiscal 2020:    
Supplemental retirement plan $ 783