| Schedule of Net Benefit Costs |
| | | | | | | | | | | | | | | | | | | | | | | | | | Three Months Ended June 30 | | | Pension Benefits | | Other Benefits | | | 2023 | | 2022 | | 2023 | | 2022 | | | (In thousands) | | Components of net periodic pension cost: | | | | | | | | | Service cost | $ | 2,915 | | | $ | 4,323 | | | $ | 1,546 | | | $ | 2,559 | | Interest cost (1) | 7,265 | | | 5,063 | | | 3,478 | | | 2,683 | | Expected return on assets (1) | (7,278) | | | (7,383) | | | (2,804) | | | (3,312) | | | | | | | | | | Amortization of prior service cost (credit) (1) | (30) | | | (58) | | | (3,285) | | | (3,308) | | Amortization of actuarial (gain) loss (1) | 178 | | | 1,951 | | | (1,863) | | | — | | Settlements (1) | 1,030 | | | — | | | — | | | — | | | Net periodic pension cost | $ | 4,080 | | | $ | 3,896 | | | $ | (2,928) | | | $ | (1,378) | |
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Nine Months Ended June 30 | | | Pension Benefits | | Other Benefits | | 2023 | | 2022 | | 2023 | | 2022 | | | (In thousands) | | Components of net periodic pension cost: | | | | | | | | | Service cost | $ | 8,731 | | | $ | 12,970 | | | $ | 4,637 | | | $ | 7,676 | | Interest cost (1) | 21,915 | | | 15,190 | | | 10,433 | | | 8,050 | | Expected return on assets (1) | (21,835) | | | (22,149) | | | (8,411) | | | (9,937) | | | | | | | | | | Amortization of prior service cost (credit) (1) | (91) | | | (174) | | | (9,856) | | | (9,925) | | Amortization of actuarial (gain) loss (1) | 506 | | | 5,853 | | | (5,589) | | | — | | Settlements (1) | 1,030 | | | — | | | — | | | — | | | Net periodic pension cost | $ | 10,256 | | | $ | 11,690 | | | $ | (8,786) | | | $ | (4,136) | |
(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 consolidated financial statements in our Annual Report on Form 10-K for the fiscal year ended September 30, 2022.
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