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Retirement Plan And Other Post-Retirement Benefits (Tables)
 6 Months Ended
Mar. 31, 2020
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 March 31,
2020
2019
 
2020
2019





 




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)
5,519

4,786

 
8,846

6,565






 




Net Periodic Benefit Cost
$
10,344

$
9,139

 
$
5,195

$
5,075

 
 
 
 
 
 
 
Retirement Plan
 
Other Post-Retirement Benefits
Six Months Ended March 31,
2020
2019
 
2020
2019
 
 
 
 
 
 
Service Cost
$
4,659

$
4,241

 
$
804

$
760

Interest Cost
14,965

19,189

 
6,457

8,572

Expected Return on Plan Assets
(30,032
)
(31,184
)
 
(14,616
)
(15,078
)
Amortization of Prior Service Cost (Credit)
365

413

 
(214
)
(214
)
Amortization of Losses
19,692

16,048

 
267

2,980

Net Amortization and Deferral for Regulatory Purposes (Including Volumetric Adjustments) (1)
7,047

5,604

 
15,094

10,536

 
 
 
 
 
 
Net Periodic Benefit Cost
$
16,696

$
14,311

 
$
7,792

$
7,556

 
 
 
 
 
 
(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.