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Retirement Plan And Other Post-Retirement Benefits (Tables)
 3 Months Ended
Dec. 31, 2017
Retirement Benefits [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,
2017
2016
 
2017
2016





 




Service Cost
$
2,480

$
2,992

 
$
458

$
612

Interest Cost
8,252

9,596

 
3,700

4,752

Expected Return on Plan Assets
(15,429
)
(14,929
)
 
(7,871
)
(7,865
)
Amortization of Prior Service Cost (Credit)
235

264

 
(107
)
(107
)
Amortization of Losses
9,301

10,672

 
2,639

4,604

Net Amortization and Deferral for Regulatory Purposes (Including Volumetric Adjustments) (1)
1,721

535

 
3,608

1,312






 




Net Periodic Benefit Cost
$
6,560

$
9,130

 
$
2,427

$
3,308

 
 
 
 
 
 
 
 
 
 
 
 
(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.