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Interim Pension and Other Postretirement Benefit Plan Information (Table)
 3 Months Ended
Dec. 31, 2018
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 months ended December 31, 2018 and 2017 are presented in the following table. 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 December 31
 
Pension Benefits
 
Other Benefits
 
2018
 
2017
 
2018
 
2017
 
(In thousands)
Components of net periodic pension cost:
 
 
 
 
 
 
 
Service cost
$
4,045

 
$
4,560

 
$
2,702

 
$
3,020

Interest cost(1)
6,799

 
6,430

 
2,961

 
2,727

Expected return on assets(1)
(7,113
)
 
(6,917
)
 
(2,665
)
 
(2,002
)
Amortization of prior service cost (credit)(1)
(58
)
 
(58
)
 
43

 
3

Amortization of actuarial (gain) loss(1)
1,608

 
3,089

 
(2,045
)
 
(1,618
)
Net periodic pension cost
$
5,281

 
$
7,104

 
$
996

 
$
2,130


(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 statement of comprehensive income or are capitalized on the condensed consolidated balance sheets as a regulatory asset or liability, as described in Note 2.