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, 2018
Dec. 31, 2017
Pension    
Net periodic benefit cost [Abstract]    
Service cost $ 2,000 $ 2,039
Interest cost 2,301 2,049
Expected return on plan assets (2,596) (2,534)
Amortization:    
Prior service cost (46) (35)
Net actuarial loss (gain) 1,061 1,752
Net benefit cost 2,720 3,271
Other Postretirement    
Net periodic benefit cost [Abstract]    
Service cost 61 84
Interest cost 180 158
Expected return on plan assets 0 0
Amortization:    
Prior service cost (49) (49)
Net actuarial loss (gain) (15) 0
Net benefit cost 177 $ 193
Contributions during the three months ended December 31, 2018:    
Other Postretirement 498  
Additional contributions expected in fiscal 2019:    
Supplemental retirement plan 577  
Supplemental retirement plan    
Contributions during the three months ended December 31, 2018:    
Pension 196  
Additional contributions expected in fiscal 2019:    
Supplemental retirement plan $ 661