Quarterly report pursuant to Section 13 or 15(d)

Pension and Other Postretirement Benefit Plans (Details)

v3.6.0.2
Pension and Other Postretirement Benefit Plans (Details) - USD ($)
$ in Thousands
3 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Pension    
Net periodic benefit cost [Abstract]    
Service cost $ 2,138 $ 1,813
Interest cost 1,841 2,406
Expected return on plan assets (2,312) (2,407)
Amortization:    
Prior service cost (45) (46)
Net actuarial loss 2,509 1,866
Net benefit cost 4,131 3,632
Benefit plan contributions [Abstract]    
Additional contributions expected in fiscal 2017: 5,109  
Other Postretirement    
Net periodic benefit cost [Abstract]    
Service cost 98 101
Interest cost 157 211
Expected return on plan assets 0 0
Amortization:    
Prior service cost (49) (49)
Net actuarial loss 0 0
Net benefit cost 206 $ 263
Benefit plan contributions [Abstract]    
Additional contributions expected in fiscal 2017: 941  
Supplemental retirement plan    
Benefit plan contributions [Abstract]    
Supplemental retirement plan 181  
Other postretirement plan 0  
Additional contributions expected in fiscal 2017: 579  
Other postretirement plan    
Benefit plan contributions [Abstract]    
Supplemental retirement plan 0  
Other postretirement plan $ 207