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Retirement Plan And Other Post-Retirement Benefits (Tables)
 9 Months Ended
Jun. 30, 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 June 30,
2017
2016
 
2017
2016





 




Service Cost
$
2,992

$
2,928

 
$
612

$
583

Interest Cost
9,596

10,579

 
4,752

5,096

Expected Return on Plan Assets
(14,929
)
(14,842
)
 
(7,865
)
(7,883
)
Amortization of Prior Service Cost (Credit)
264

308

 
(107
)
(228
)
Amortization of Losses
10,672

8,062

 
4,604

1,382

Net Amortization and Deferral for Regulatory Purposes (Including Volumetric Adjustments) (1)
(3,193
)
14

 
1,302

3,936






 




Net Periodic Benefit Cost
$
5,402

$
7,049

 
$
3,298

$
2,886

 
 
 
 
 
 
 
Retirement Plan
 
Other Post-Retirement Benefits
Nine Months Ended June 30,
2017
2016
 
2017
2016
 
 
 
 
 
 
Service Cost
$
8,977

$
8,783

 
$
1,837

$
1,748

Interest Cost
28,788

31,736

 
14,256

15,289

Expected Return on Plan Assets
(44,788
)
(44,527
)
 
(23,594
)
(23,651
)
Amortization of Prior Service Cost (Credit)
793

925

 
(322
)
(684
)
Amortization of Losses
32,015

24,186

 
13,811

4,147

Net Amortization and Deferral for Regulatory Purposes (Including Volumetric Adjustments) (1)
3,577

7,531

 
6,404

14,657

 
 
 
 
 
 
Net Periodic Benefit Cost
$
29,362

$
28,634

 
$
12,392

$
11,506

 
 
 
 
 
 
(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.