XML 61 R28.htm IDEA: XBRL DOCUMENT v3.20.1
Interim Pension and Other Postretirement Benefit Plan Information (Table)
 6 Months Ended
Mar. 31, 2020
Retirement Benefits, Description [Abstract]  
Schedule of Net Benefit Costs
The components of our net periodic pension cost for our pension and other postretirement benefit plans for the three and six months ended March 31, 2020 and 2019 are presented in the following tables. Most of these costs are recoverable through our tariff rates. A portion of these costs is capitalized into our rate base or deferred as a regulatory asset or liability. The remaining costs are recorded as a component of operation and maintenance expense or other non-operating expense.
 
Three Months Ended March 31
 
Pension Benefits
 
Other Benefits
 
2020
 
2019
 
2020
 
2019
 
(In thousands)
Components of net periodic pension cost:
 
 
 
 
 
 
 
Service cost
$
4,652

 
$
4,045

 
$
3,366

 
$
2,703

Interest cost(1)
5,843

 
6,801

 
2,653

 
2,958

Expected return on assets(1)
(7,079
)
 
(7,113
)
 
(2,625
)
 
(2,665
)
Amortization of prior service cost (credit)(1)
(58
)
 
(58
)
 
43

 
44

Amortization of actuarial (gain) loss(1)
3,242

 
1,607

 
(334
)
 
(2,044
)
Net periodic pension cost
$
6,600

 
$
5,282

 
$
3,103

 
$
996

 
Six Months Ended March 31
 
Pension Benefits
 
Other Benefits
 
2020
 
2019
 
2020
 
2019
 
(In thousands)
Components of net periodic pension cost:
 
 
 
 
 
 
 
Service cost
$
9,305

 
$
8,090

 
$
6,733

 
$
5,405

Interest cost(1)
11,686

 
13,600

 
5,306

 
5,919

Expected return on assets(1)
(14,158
)
 
(14,226
)
 
(5,249
)
 
(5,330
)
Amortization of prior service cost (credit)(1)
(116
)
 
(116
)
 
87

 
87

Amortization of actuarial (gain) loss(1)
6,483

 
3,215

 
(669
)
 
(4,089
)
Net periodic pension cost
$
13,200

 
$
10,563

 
$
6,208

 
$
1,992



(1)
The components of net periodic cost other than the service cost component are included in the line item other non-operating expense in the condensed consolidated statements of comprehensive income or are capitalized on the condensed consolidated balance sheets as a regulatory asset or liability, as described in Note 2 to the financial statements in our Annual Report on Form 10-K for the fiscal year ended September 30, 2019.