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Retirement Plan And Other Post-Retirement Benefits (Tables)
 9 Months Ended
Jun. 30, 2016
Compensation and Retirement Disclosure [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,
2016
2015
 
2016
2015





 




Service Cost
$
2,928

$
3,012

 
$
583

$
673

Interest Cost
10,579

10,304

 
5,096

4,821

Expected Return on Plan Assets
(14,842
)
(14,904
)
 
(7,883
)
(8,522
)
Amortization of Prior Service Cost (Credit)
308

46

 
(228
)
(478
)
Amortization of Losses
8,062

9,032

 
1,382

1,037

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

88

 
3,936

4,739






 




Net Periodic Benefit Cost
$
7,049

$
7,578

 
$
2,886

$
2,270

 
 
 
 
 
 
 
Retirement Plan
 
Other Post-Retirement Benefits
Nine Months Ended June 30,
2016
2015
 
2016
2015
 
 
 
 
 
 
Service Cost
$
8,783

$
9,036

 
$
1,748

$
2,019

Interest Cost
31,736

30,913

 
15,289

14,464

Expected Return on Plan Assets
(44,527
)
(44,712
)
 
(23,651
)
(25,566
)
Amortization of Prior Service Cost (Credit)
925

137

 
(684
)
(1,435
)
Amortization of Losses
24,186

27,097

 
4,147

3,111

Net Amortization and Deferral for Regulatory Purposes (Including Volumetric Adjustments) (1)
7,531

8,434

 
14,657

17,055

 
 
 
 
 
 
Net Periodic Benefit Cost
$
28,634

$
30,905

 
$
11,506

$
9,648

 
 
 
 
 
 
(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.