XML 37 R24.htm IDEA: XBRL DOCUMENT v3.10.0.1
Retirement Plan And Other Post-Retirement Benefits (Tables)
 3 Months Ended
Dec. 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 December 31,
2018
2017
 
2018
2017





 




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)
819

1,721

 
3,971

3,608






 




Net Periodic Benefit Cost
$
5,172

$
6,560

 
$
2,481

$
2,427

 
 
 
 
 
 
(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.