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Pension and Other Postretirement Benefit Plans (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2019 | Mar. 31, 2018
Pension |  |  |  |
Net periodic benefit cost [Abstract] |  |  |  |
Service cost | $ 2,000 | $ 2,039 | $ 4,000 | $ 4,078
Interest cost | 2,301 | 2,049 | 4,602 | 4,098
Expected return on plan assets | (2,596) | (2,534) | (5,192) | (5,068)
Amortization: |  |  |  |
Prior service cost | (46) | (35) | (92) | (70)
Net actuarial loss (gain) | 1,100 | 1,752 | 2,161 | 3,504
Net benefit cost | 2,759 | 3,271 | 5,479 | 6,542
Other Postretirement |  |  |  |
Net periodic benefit cost [Abstract] |  |  |  |
Service cost | 61 | 84 | 122 | 168
Interest cost | 180 | 158 | 360 | 316
Expected return on plan assets | 0 | 0 | 0 | 0
Amortization: |  |  |  |
Prior service cost | (49) | (49) | (98) | (98)
Net actuarial loss (gain) | (15) | 0 | (30) | 0
Net benefit cost | 177 | $ 193 | 354 | $ 386
Contributions during the six months ended March 31, 2019: |  |  |  |
Other Postretirement |  |  | 757 |
Additional contributions expected in fiscal 2019: |  |  |  |
Supplemental retirement plan | 318 |  | 318 |
Supplemental retirement plan |  |  |  |
Contributions during the six months ended March 31, 2019: |  |  |  |
Pension |  |  | 391 |
Additional contributions expected in fiscal 2019: |  |  |  |
Supplemental retirement plan | $ 466 |  | $ 466 |

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