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Pension and Other Postretirement Benefit Plans (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2020 | Mar. 31, 2019
Pension |  |  |  |
Net periodic benefit cost [Abstract] |  |  |  |
Service cost | $ 2,170 | $ 2,000 | $ 4,340 | $ 4,000
Interest cost * | 1,933 | 2,301 | 3,866 | 4,602
Expected return on plan assets * | (2,232) | (2,596) | (4,464) | (5,192)
Amortization: |  |  |  |
Prior service cost | (47) | (46) | (94) | (92)
Net actuarial loss (gain) * | 2,386 | 1,100 | 4,773 | 2,161
Net benefit cost | 4,210 | 2,759 | 8,421 | 5,479
Supplemental retirement plan |  |  |  |
Contributions during the six months ended March 31, 2020: |  |  |  |
Pension |  |  | 382 |
Additional contributions expected in fiscal 2020: |  |  |  |
Supplemental retirement plan | 500 |  | 500 |
Other Postretirement |  |  |  |
Net periodic benefit cost [Abstract] |  |  |  |
Service cost | 64 | 61 | 128 | 122
Interest cost * | 140 | 180 | 280 | 360
Expected return on plan assets * | 0 | 0 | 0 | 0
Amortization: |  |  |  |
Prior service cost | (23) | (49) | (46) | (98)
Net actuarial loss (gain) * | 0 | (15) | 0 | (30)
Net benefit cost | 181 | $ 177 | 362 | $ 354
Contributions during the six months ended March 31, 2020: |  |  |  |
Other Postretirement |  |  | 457 |
Additional contributions expected in fiscal 2020: |  |  |  |
Supplemental retirement plan | $ 532 |  | $ 532 |

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