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Interim Pension and Other Postretirement Benefit Plan Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Contribution to postretirement medical plans |  |  | $ 11,100 |
Pension Benefits |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | $ 4,323 | $ 4,609 | 12,970 | $ 13,834
Interest cost | 5,063 | 5,016 | 15,190 | 15,072
Expected return on assets | (7,383) | (6,978) | (22,149) | (20,934)
Amortization of prior service cost (credit) | (58) | (58) | (174) | (174)
Amortization of actuarial (gain) loss | 1,951 | 3,062 | 5,853 | 9,405
Settlements | 0 | 8,999 | 0 | 8,999
Net periodic pension cost | 3,896 | 14,650 | 11,690 | 26,202
Other Benefits |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | 2,559 | 4,305 | 7,676 | 12,917
Interest cost | 2,683 | 2,661 | 8,050 | 7,981
Expected return on assets | (3,312) | (2,613) | (9,937) | (7,841)
Amortization of prior service cost (credit) | (3,308) | 44 | (9,925) | 130
Amortization of actuarial (gain) loss | 0 | 0 | 0 | 0
Settlements | 0 | 0 | 0 | 0
Net periodic pension cost | (1,378) | $ 4,397 | (4,136) | $ 13,187
Minimum | Other Benefits |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Expected future contributions | 15,000 |  | 15,000 |
Maximum | Other Benefits |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Expected future contributions | $ 25,000 |  | $ 25,000 |

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