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Pension and Other Postretirement Benefit Plans (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Amortization: |  |
Settlement loss * | $ 30,856 |
Employer contributions | 35,706 |
Benefit payments | 185,958 |
Annuity contracts purchased | 56,274 |
Pension |  |
Net periodic benefit cost [Abstract] |  |
Service cost | 380 | $ 2,213
Interest cost * | 990 | 1,548
Expected return on plan assets * | (1,042) | (2,763)
Amortization: |  |
Prior service cost (credit) | 47 | (17)
Net actuarial loss * | 201 | 3,021
Settlement loss * | 30,856 | 0
Net benefit cost | 31,432 | 4,002
Contributions during the three months ended December 31, 2021: |  |
Pension | 35,706 |
Other Postretirement |  |
Net periodic benefit cost [Abstract] |  |
Service cost | 41 | 50
Interest cost * | 103 | 94
Expected return on plan assets * | 0 | 0
Amortization: |  |
Prior service cost (credit) | (91) | (91)
Net actuarial loss * | 0 | 0
Settlement loss * | 0 | 0
Net benefit cost | 53 | $ 53
Contributions during the three months ended December 31, 2021: |  |
Other Postretirement | 83 |
Additional contributions expected in fiscal 2022: |  |
Additional contributions expected in fiscal 2022 | 801 |
Supplemental retirement plan |  |
Contributions during the three months ended December 31, 2021: |  |
Pension | 199 |
Additional contributions expected in fiscal 2022: |  |
Additional contributions expected in fiscal 2022 | $ 561 |

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