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Retirement Plan And Other Post-Retirement Benefits (Tables)
 9 Months Ended
Jun. 30, 2014
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,
2014
2013
 
2014
2013





 




Service Cost
$
2,997

$
3,961

 
$
735

$
1,176

Interest Cost
10,893

9,124

 
5,327

4,803

Expected Return on Plan Assets
(14,993
)
(14,336
)
 
(9,356
)
(8,218
)
Amortization of Prior Service Cost (Credit)
52

60

 
(534
)
(534
)
Amortization of Transition Amount
—

—

 
—

2

Amortization of Losses
9,002

13,194

 
661

5,223

Net Amortization and Deferral for Regulatory Purposes (Including Volumetric Adjustments) (1)
456

(3,854
)
 
5,325

2,393






 




Net Periodic Benefit Cost
$
8,407

$
8,149

 
$
2,158

$
4,845


 
 
 
 
 
 
 
Retirement Plan
 
Other Post-Retirement Benefits
Nine Months Ended June 30,
2014
2013
 
2014
2013
 
 
 
 
 
 
Service Cost
$
8,990

$
11,884

 
$
2,204

$
3,529

Interest Cost
32,681

27,373

 
15,981

14,409

Expected Return on Plan Assets
(44,980
)
(43,009
)
 
(28,067
)
(24,654
)
Amortization of Prior Service Cost (Credit)
157

179

 
(1,604
)
(1,604
)
Amortization of Transition Amount
—

—

 
—

6

Amortization of Losses
27,005

39,582

 
1,984

15,669

Net Amortization and Deferral for Regulatory Purposes (Including Volumetric Adjustments) (1)
10,591

(5,813
)
 
19,314

11,555

 
 
 
 
 
 
Net Periodic Benefit Cost
$
34,444

$
30,196

 
$
9,812

$
18,910


(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.