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, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Pension        
Net periodic benefit cost [Abstract]        
Service cost $ 2,138 $ 1,813 $ 6,414 $ 5,439
Interest cost 1,841 2,406 5,523 7,218
Expected return on plan assets (2,312) (2,407) (6,936) (7,221)
Amortization:        
Prior service cost (45) (46) (135) (138)
Net actuarial loss 2,509 1,866 7,527 5,598
Net benefit cost 4,131 3,632 12,393 10,896
Defined Benefit Plan, Expected Future Employer Contributions [Abstract]        
Supplemental retirement plan     5,110  
Other postretirement plan     0  
Additional contributions expected in fiscal 2017: 0   0  
Supplemental retirement plan        
Defined Benefit Plan, Expected Future Employer Contributions [Abstract]        
Supplemental retirement plan     543  
Other postretirement plan     0  
Additional contributions expected in fiscal 2017: 217   217  
Other postretirement plan        
Net periodic benefit cost [Abstract]        
Service cost 98 101 294 303
Interest cost 157 211 471 633
Expected return on plan assets 0 0 0 0
Amortization:        
Prior service cost (49) (49) (147) (147)
Net actuarial loss 0 0 0 0
Net benefit cost 206 $ 263 618 $ 789
Defined Benefit Plan, Expected Future Employer Contributions [Abstract]        
Supplemental retirement plan     0  
Other postretirement plan     552  
Additional contributions expected in fiscal 2017: $ 596   $ 596