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, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Pension        
Net periodic benefit cost [Abstract]        
Service cost $ 2,000 $ 2,039 $ 6,000 $ 6,117
Interest cost 2,301 2,049 6,903 6,147
Expected return on plan assets (2,596) (2,534) (7,788) (7,602)
Amortization:        
Prior service cost (46) (35) (138) (105)
Net actuarial loss (gain) 1,081 1,753 3,242 5,257
Net benefit cost 2,740 3,272 8,219 9,814
Other Postretirement        
Net periodic benefit cost [Abstract]        
Service cost 61 84 183 252
Interest cost 180 158 540 474
Expected return on plan assets 0 0 0 0
Amortization:        
Prior service cost (49) (49) (147) (147)
Net actuarial loss (gain) (15) 0 (45) 0
Net benefit cost 177 $ 193 531 $ 579
Contributions during the nine months ended June 30, 2019:        
Other Postretirement     914  
Additional contributions expected in fiscal 2019:        
Supplemental retirement plan 161   161  
Supplemental retirement plan        
Contributions during the nine months ended June 30, 2019:        
Pension     587  
Additional contributions expected in fiscal 2019:        
Supplemental retirement plan $ 270   $ 270