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Pension and Other Postretirement Benefit Plans (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Pension |  |  |  |
Net periodic benefit cost [Abstract] |  |  |  |
Service cost | $ 2,000 | $ 2,039 | $ 6,000 | $ 6,117
Interest cost | 2,301 | 2,049 | 6,903 | 6,147
Expected return on plan assets | (2,596) | (2,534) | (7,788) | (7,602)
Amortization: |  |  |  |
Prior service cost | (46) | (35) | (138) | (105)
Net actuarial loss (gain) | 1,081 | 1,753 | 3,242 | 5,257
Net benefit cost | 2,740 | 3,272 | 8,219 | 9,814
Other Postretirement |  |  |  |
Net periodic benefit cost [Abstract] |  |  |  |
Service cost | 61 | 84 | 183 | 252
Interest cost | 180 | 158 | 540 | 474
Expected return on plan assets | 0 | 0 | 0 | 0
Amortization: |  |  |  |
Prior service cost | (49) | (49) | (147) | (147)
Net actuarial loss (gain) | (15) | 0 | (45) | 0
Net benefit cost | 177 | $ 193 | 531 | $ 579
Contributions during the nine months ended June 30, 2019: |  |  |  |
Other Postretirement |  |  | 914 |
Additional contributions expected in fiscal 2019: |  |  |  |
Supplemental retirement plan | 161 |  | 161 |
Supplemental retirement plan |  |  |  |
Contributions during the nine months ended June 30, 2019: |  |  |  |
Pension |  |  | 587 |
Additional contributions expected in fiscal 2019: |  |  |  |
Supplemental retirement plan | $ 270 |  | $ 270 |

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