Quarterly report pursuant to Section 13 or 15(d)

Pension and Other Postretirement Benefit Plans (Details)

v3.5.0.2
Pension and Other Postretirement Benefit Plans (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Pension        
Net periodic benefit cost [Abstract]        
Service cost $ 1,813 $ 1,655 $ 5,439 $ 4,965
Interest cost 2,406 2,145 7,218 6,435
Expected return on plan assets (2,407) (2,470) (7,221) (7,410)
Amortization [Abstract]        
Prior service cost (46) (45) (138) (135)
Net actuarial loss 1,866 1,564 5,598 4,692
Net benefit cost 3,632 2,849 10,896 8,547
Other Postretirement        
Net periodic benefit cost [Abstract]        
Service cost 101 114 303 342
Interest cost 211 221 633 663
Expected return on plan assets 0 0 0 0
Amortization [Abstract]        
Prior service cost (49) (49) (147) (147)
Net actuarial loss 0 0 0 0
Net benefit cost $ 263 $ 286 789 $ 858
Benefit plan contributions [Abstract]        
Other postretirement plan     1,018  
Additional contributions expected in fiscal 2016:     252  
Supplemental Retirement Plan        
Benefit plan contributions [Abstract]        
Supplemental retirement plan     543  
Additional contributions expected in fiscal 2016:     $ 206