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Retirement Plan And Other Post-Retirement Benefits (Tables)
 6 Months Ended
Mar. 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 March 31,
2019
2018
 
2019
2018





 




Service Cost
$
2,120

$
2,480

 
$
380

$
458

Interest Cost
9,594

8,252

 
4,286

3,700

Expected Return on Plan Assets
(15,591
)
(15,429
)
 
(7,539
)
(7,871
)
Amortization of Prior Service Cost (Credit)
206

235

 
(107
)
(107
)
Amortization of Losses
8,024

9,301

 
1,490

2,639

Net Amortization and Deferral for Regulatory Purposes (Including Volumetric Adjustments) (1)
4,786

6,492

 
6,565

6,250






 




Net Periodic Benefit Cost
$
9,139

$
11,331

 
$
5,075

$
5,069

 
 
 
 
 
 
 
Retirement Plan
 
Other Post-Retirement Benefits
Six Months Ended March 31,
2019
2018
 
2019
2018
 
 
 
 
 
 
Service Cost
$
4,241

$
4,960

 
$
760

$
915

Interest Cost
19,189

16,503

 
8,572

7,400

Expected Return on Plan Assets
(31,184
)
(30,857
)
 
(15,078
)
(15,741
)
Amortization of Prior Service Cost (Credit)
413

469

 
(214
)
(214
)
Amortization of Losses
16,048

18,602

 
2,980

5,279

Net Amortization and Deferral for Regulatory Purposes (Including Volumetric Adjustments) (1)
5,604

8,214

 
10,536

9,858

 
 
 
 
 
 
Net Periodic Benefit Cost
$
14,311

$
17,891

 
$
7,556

$
7,497

 
 
 
 
 
 
(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.