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Retirement Plan And Other Post-Retirement Benefits (Tables)
 3 Months Ended
Dec. 31, 2016
Compensation and Retirement Disclosure [Abstract]  
Components of Net Periodic Benefit Cost
Components of Net Periodic Benefit Cost (in thousands):
 
 
Retirement Plan
 
Other Post-Retirement Benefits
Three Months Ended December 31,
2016
2015
 
2016
2015





 




Service Cost
$
2,992

$
2,928

 
$
612

$
583

Interest Cost
9,596

10,579

 
4,752

5,096

Expected Return on Plan Assets
(14,929
)
(14,842
)
 
(7,865
)
(7,883
)
Amortization of Prior Service Cost (Credit)
264

308

 
(107
)
(228
)
Amortization of Losses
10,672

8,062

 
4,604

1,382

Net Amortization and Deferral for Regulatory Purposes (Including Volumetric Adjustments) (1)
535

1,906

 
1,312

4,121






 




Net Periodic Benefit Cost
$
9,130

$
8,941

 
$
3,308

$
3,071

 
 
 
 
 
 
(1) 
The Company’s policy is to record retirement plan and other post-retirement benefit costs in the Utility segment on a volumetric basis to reflect the fact that the Utility segment experiences higher throughput of natural gas in the winter months and lower throughput of natural gas in the summer months.