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Pension and Other Postretirement Benefit Plans (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Common Stock Class A |  |  |  |
Amortization: |  |  |  |
Value of employee benefit plan |  |  | $ 15,000 |
Pension |  |  |  |
Net periodic benefit cost [Abstract] |  |  |  |
Service cost | $ 2,170 | $ 2,000 | 6,510 | $ 6,000
Interest cost * | 1,933 | 2,301 | 5,799 | 6,903
Expected return on plan assets * | (2,232) | (2,596) | (6,696) | (7,788)
Amortization: |  |  |  |
Prior service cost | (47) | (46) | (141) | (138)
Net actuarial loss (gain) * | 2,386 | 1,081 | 7,159 | 3,242
Net benefit cost | 4,210 | 2,740 | 12,631 | 8,219
Additional contributions expected in fiscal 2020: |  |  |  |
Supplemental retirement plan | 15,000 |  | 15,000 |
Supplemental retirement plan |  |  |  |
Contributions during the nine months ended June 30, 2020: |  |  |  |
Pension |  |  | 589 |
Additional contributions expected in fiscal 2020: |  |  |  |
Supplemental retirement plan | 293 |  | 293 |
Other Postretirement |  |  |  |
Net periodic benefit cost [Abstract] |  |  |  |
Service cost | 64 | 61 | 192 | 183
Interest cost * | 140 | 180 | 420 | 540
Expected return on plan assets * | 0 | 0 | 0 | 0
Amortization: |  |  |  |
Prior service cost | (23) | (49) | (69) | (147)
Net actuarial loss (gain) * | 0 | (15) | 0 | (45)
Net benefit cost | 181 | $ 177 | 543 | $ 531
Contributions during the nine months ended June 30, 2020: |  |  |  |
Other Postretirement |  |  | 726 |
Additional contributions expected in fiscal 2020: |  |  |  |
Supplemental retirement plan | $ 263 |  | $ 263 |

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