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Interim Pension and Other Postretirement Benefit Plan Information (Table)
 9 Months Ended
Jun. 30, 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 nine months ended June 30, 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 June 30
 
Pension Benefits
 
Other Benefits
 
2020
 
2019
 
2020
 
2019
 
(In thousands)
Components of net periodic pension cost:
 
 
 
 
 
 
 
Service cost
$
4,652

 
$
4,044

 
$
3,366

 
$
2,702

Interest cost(1)
5,843

 
6,799

 
2,653

 
2,960

Expected return on assets(1)
(7,079
)
 
(7,113
)
 
(2,625
)
 
(2,664
)
Amortization of prior service cost (credit)(1)
(58
)
 
(57
)
 
43

 
43

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

 
1,606

 
(334
)
 
(2,045
)
Net periodic pension cost
$
6,600

 
$
5,279

 
$
3,103

 
$
996

 
Nine Months Ended June 30
 
Pension Benefits
 
Other Benefits
 
2020
 
2019
 
2020
 
2019
 
(In thousands)
Components of net periodic pension cost:
 
 
 
 
 
 
 
Service cost
$
13,957

 
$
12,134

 
$
10,099

 
$
8,107

Interest cost(1)
17,529

 
20,399

 
7,959

 
8,879

Expected return on assets(1)
(21,237
)
 
(21,339
)
 
(7,874
)
 
(7,994
)
Amortization of prior service cost (credit)(1)
(174
)
 
(173
)
 
130

 
130

Amortization of actuarial (gain) loss(1)
9,725

 
4,821

 
(1,003
)
 
(6,134
)
Net periodic pension cost
$
19,800

 
$
15,842

 
$
9,311

 
$
2,988



(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.