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v3.23.1

Interim Pension and Other Postretirement Benefit Plan Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2023 | Mar. 31, 2022 | Mar. 31, 2023 | Mar. 31, 2022
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Contribution to postretirement medical plans |  |  | $ 6,200 |
Pension Benefits |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | $ 2,908 | $ 4,324 | 5,816 | $ 8,647
Interest cost | 7,325 | 5,064 | 14,650 | 10,127
Expected return on assets | (7,278) | (7,383) | (14,556) | (14,766)
Amortization of prior service cost (credit) | (30) | (58) | (61) | (116)
Amortization of actuarial (gain) loss | 164 | 1,951 | 329 | 3,902
Net periodic pension cost | 3,089 | 3,898 | 6,178 | 7,794
Other Benefits |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | 1,546 | 2,558 | 3,091 | 5,117
Interest cost | 3,478 | 2,684 | 6,955 | 5,367
Expected return on assets | (2,804) | (3,313) | (5,608) | (6,625)
Amortization of prior service cost (credit) | (3,285) | (3,308) | (6,571) | (6,617)
Amortization of actuarial (gain) loss | (1,863) | 0 | (3,726) | 0
Net periodic pension cost | (2,928) | $ (1,379) | (5,859) | $ (2,758)
Other Benefits | Minimum |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Expected future contributions | 15,000 |  | 15,000 |
Other Benefits | Maximum |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Expected future contributions | $ 25,000 |  | $ 25,000 |

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