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Retirement Benefits (Tables) | 6 Months Ended
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Mar. 31, 2021
Defined Benefit Plan Disclosure [Line Items] |
Schedule of Amount of Expense Associated with Defined Contribution Plans | The amount of expense associated with defined contribution plans was as follows:
|  | Three-Months Ended |  |  | Six-Months Ended |
|  | March 31, |  |  | March 31, |
|  | 2021 |  |  | 2020 |  |  | 2021 |  |  | 2020 |
Company costs |  | $ | 8,497 |  |  | $ | 8,910 |  |  | $ | 16,533 |  |  | $ | 17,614 |
Schedule of Estimated Remaining Cash Contributions | Woodward estimates its remaining cash contributions in fiscal year 2021 will be as follows:
Retirement pension benefits: |  |  |  |
United States |  | $ | — |
United Kingdom |  |  | 328 |
Japan |  |  | — |
Germany |  |  | 385 |
Other postretirement benefits |  |  | 2,135 |
Defined Benefit Pension Plan [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Schedule of Net Periodic Benefit Costs | The components of the net periodic retirement pension costs recognized are as follows:
|  | Three-Months Ended March 31, |
|  | United States |  |  | Other Countries |  |  | Total |
|  | 2021 |  |  | 2020 |  |  | 2021 |  |  | 2020 |  |  | 2021 |  |  | 2020 |
Service cost |  | $ | 432 |  |  | $ | 415 |  |  | $ | 736 |  |  | $ | 708 |  |  | $ | 1,168 |  |  | $ | 1,123 |
Interest cost |  |  | 1,239 |  |  |  | 1,397 |  |  |  | 343 |  |  |  | 319 |  |  |  | 1,582 |  |  |  | 1,716 |
Expected return on plan assets |  |  | (3,536 | ) |  |  | (3,086 | ) |  |  | (625 | ) |  |  | (708 | ) |  |  | (4,161 | ) |  |  | (3,794 | )
Amortization of: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net actuarial loss |  |  | 135 |  |  |  | 357 |  |  |  | 234 |  |  |  | 260 |  |  |  | 369 |  |  |  | 617 |
Prior service cost |  |  | 243 |  |  |  | 234 |  |  |  | 6 |  |  |  | 6 |  |  |  | 249 |  |  |  | 240 |
Net periodic retirement pension (benefit) cost |  | $ | (1,487 | ) |  | $ | (683 | ) |  | $ | 694 |  |  | $ | 585 |  |  | $ | (793 | ) |  | $ | (98 | )
Contributions paid |  | $ | — |  |  | $ | — |  |  | $ | 675 |  |  | $ | 601 |  |  | $ | 675 |  |  | $ | 601 |
|  | Six-Months Ended March 31, |
|  | United States |  |  | Other Countries |  |  | Total |
|  | 2021 |  |  | 2020 |  |  | 2021 |  |  | 2020 |  |  | 2021 |  |  | 2020 |
Service cost |  | $ | 864 |  |  | $ | 830 |  |  | $ | 1,465 |  |  | $ | 1,418 |  |  | $ | 2,329 |  |  | $ | 2,248 |
Interest cost |  |  | 2,478 |  |  |  | 2,795 |  |  |  | 676 |  |  |  | 640 |  |  |  | 3,154 |  |  |  | 3,435 |
Expected return on plan assets |  |  | (7,072 | ) |  |  | (6,173 | ) |  |  | (1,227 | ) |  |  | (1,540 | ) |  |  | (8,299 | ) |  |  | (7,713 | )
Amortization of: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net actuarial loss |  |  | 270 |  |  |  | 715 |  |  |  | 462 |  |  |  | 521 |  |  |  | 732 |  |  |  | 1,236 |
Prior service cost |  |  | 485 |  |  |  | 468 |  |  |  | 12 |  |  |  | 12 |  |  |  | 497 |  |  |  | 480 |
Net periodic retirement pension (benefit) cost |  | $ | (2,975 | ) |  | $ | (1,365 | ) |  | $ | 1,388 |  |  | $ | 1,051 |  |  | $ | (1,587 | ) |  | $ | (314 | )
Contributions paid |  | $ | — |  |  | $ | — |  |  | $ | 1,218 |  |  | $ | 1,732 |  |  | $ | 1,218 |  |  | $ | 1,732 |
Other Postretirement Benefit Plans [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Schedule of Net Periodic Benefit Costs | The components of the net periodic other postretirement benefit costs recognized are as follows:
|  | Three-Months Ended |  |  | Six-Months Ended |
|  | March 31, |  |  | March 31, |
|  | 2021 |  |  | 2020 |  |  | 2021 |  |  | 2020 |
Service cost |  | $ | 1 |  |  | $ | — |  |  | $ | 1 |  |  | $ | 1 |
Interest cost |  |  | 149 |  |  |  | 196 |  |  |  | 299 |  |  |  | 391 |
Amortization of: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net actuarial loss |  |  | 8 |  |  |  | 11 |  |  |  | 15 |  |  |  | 23 |
Prior service cost |  |  | 1 |  |  |  | — |  |  |  | 1 |  |  |  | 1 |
Net periodic other postretirement cost |  | $ | 159 |  |  | $ | 207 |  |  | $ | 316 |  |  | $ | 416 |
Contributions paid |  | $ | 940 |  |  | $ | 176 |  |  | $ | 978 |  |  | $ | 521 |

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