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, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Benefit plan contributions [Abstract]        
Agreement to settle installment payment obligation in exchange for a lump-sum payment $ 18,157      
Settlement of gain recognized in other income (deductions) 11,522      
Pension [Member]        
Net periodic benefit cost [Abstract]        
Service cost 1,655 $ 1,582 $ 4,965 $ 4,746
Interest cost 2,145 2,213 6,435 6,639
Expected return on plan assets (2,470) (2,396) (7,410) (7,188)
Amortization [Abstract]        
Prior service cost (45) (52) (135) (156)
Net actuarial loss (gain) 1,564 991 4,692 2,973
Net benefit cost 2,849 2,338 8,547 7,014
Other Postretirement [Member]        
Net periodic benefit cost [Abstract]        
Service cost 114 109 342 327
Interest cost 221 230 663 690
Expected return on plan assets 0 0 0 0
Amortization [Abstract]        
Prior service cost (49) (23) (147) (66)
Net actuarial loss (gain) 0 (49) 0 (147)
Net benefit cost $ 286 $ 267 858 $ 804
Benefit plan contributions [Abstract]        
Other postretirement plan     1,019  
Additional contributions expected in fiscal 2015     250  
Supplemental Retirement Plan [Member]        
Benefit plan contributions [Abstract]        
Supplemental retirement plan     543  
Additional contributions expected in fiscal 2015     $ 190