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Retirement Plan And Other Post-Retirement Benefits (Tables)
 9 Months Ended
Jun. 30, 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 June 30,
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)
(113
)
712

 
3,757

3,386






 




Net Periodic Benefit Cost
$
4,240

$
5,551

 
$
2,267

$
2,205

 
 
 
 
 
 
 
Retirement Plan
 
Other Post-Retirement Benefits
Nine Months Ended June 30,
2019
2018
 
2019
2018
 
 
 
 
 
 
Service Cost
$
6,362

$
7,441

 
$
1,140

$
1,373

Interest Cost
28,783

24,754

 
12,858

11,101

Expected Return on Plan Assets
(46,775
)
(46,286
)
 
(22,618
)
(23,612
)
Amortization of Prior Service Cost (Credit)
619

703

 
(321
)
(322
)
Amortization of Losses
24,072

27,904

 
4,471

7,918

Net Amortization and Deferral for Regulatory Purposes (Including Volumetric Adjustments) (1)
5,490

8,926

 
14,294

13,243

 
 
 
 
 
 
Net Periodic Benefit Cost
$
18,551

$
23,442

 
$
9,824

$
9,701

 
 
 
 
 
 
(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.