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Retirement Plan And Other Post-Retirement Benefits (Tables)
 6 Months Ended
Mar. 31, 2018
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,
2018
2017
 
2018
2017





 




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)
6,492

6,234

 
6,250

3,790






 




Net Periodic Benefit Cost
$
11,331

$
14,829

 
$
5,069

$
5,786

 
 
 
 
 
 
 
Retirement Plan
 
Other Post-Retirement Benefits
Six Months Ended March 31,
2018
2017
 
2018
2017
 
 
 
 
 
 
Service Cost
$
4,960

$
5,984

 
$
915

$
1,224

Interest Cost
16,503

19,192

 
7,400

9,504

Expected Return on Plan Assets
(30,857
)
(29,859
)
 
(15,741
)
(15,729
)
Amortization of Prior Service Cost (Credit)
469

529

 
(214
)
(214
)
Amortization of Losses
18,602

21,343

 
5,279

9,207

Net Amortization and Deferral for Regulatory Purposes (Including Volumetric Adjustments) (1)
8,214

6,770

 
9,858

5,102

 
 
 
 
 
 
Net Periodic Benefit Cost
$
17,891

$
23,959

 
$
7,497

$
9,094

 
 
 
 
 
 
(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.