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Retirement Plan And Other Post-Retirement Benefits (Tables)
 3 Months Ended
Dec. 31, 2019
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,
2019
2018
 
2019
2018





 




Service Cost
$
2,330

$
2,120

 
$
402

$
380

Interest Cost
7,483

9,594

 
3,228

4,286

Expected Return on Plan Assets
(15,016
)
(15,591
)
 
(7,308
)
(7,539
)
Amortization of Prior Service Cost (Credit)
182

206

 
(107
)
(107
)
Amortization of Losses
9,846

8,024

 
134

1,490

Net Amortization and Deferral for Regulatory Purposes (Including Volumetric Adjustments) (1)
1,527

819

 
6,249

3,971






 




Net Periodic Benefit Cost
$
6,352

$
5,172

 
$
2,598

$
2,481

 
 
 
 
 
 
(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.