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Retirement Benefits (Narrative) (Details) shares in Thousands, $ in Thousands |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 01, 2018 USD ($) | Mar. 31, 2020 USD ($) shares | Mar. 31, 2019 USD ($) shares | Mar. 31, 2018 USD ($) shares | Sep. 30, 2020 USD ($) yr shares | Sep. 30, 2019 USD ($) shares | Sep. 30, 2018 USD ($) shares
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Percentage of annual contribution equal to eligible prior year wages |  |  |  |  | 5.00% |  |
Number of years of service |  |  |  |  | 2 years |  |
Common shares issued from treasury stock for benefit plans |  |  |  |  | $ 14,748 | $ 14,846 | $ 14,741
Shares of woodward stock held in woodward retirement savings plan | shares |  |  |  |  | 3,199 | 3,623 |
Accrued liabilities |  |  |  |  | $ 11,230 | $ 11,701 |
Treasury Stock at Cost [Member] |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Common shares issued from treasury stock for benefit plans |  | $ 14,748 | $ 14,846 | $ 14,741 | $ 5,328 | $ 5,673 | $ 7,584
Common shares issued from treasury stock for benefit plans, shares | shares |  | 124 | 158 | 202 | 124 | 158 | 202
Defined Benefit Pension Plan [Member] |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Current portion of pension obligation |  |  |  |  | $ 1,059 | $ 1,539 |
Net periodic retirement (benefit) cost |  |  |  |  | (346) | (1,238) | $ (2,499)
Projected benefit obligation |  |  |  |  | 307,623 | 297,130 | 253,517
Fair value of plan assets |  |  |  |  | 266,709 | 234,133 | 227,722
Defined Benefit Pension Plan [Member] | Cash and Cash Equivalents |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Fair value of plan assets |  |  |  |  | 1,385 | 2,986 |
Defined Benefit Pension Plan [Member] | Pooled funds: Index linked U.K. government securities fund [Member] |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Fair value of plan assets |  |  |  |  | 5,767 | 5,491 |
Defined Benefit Pension Plan [Member] | Pooled funds: Index linked U.K. long-term government securities fund [Member] |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Fair value of plan assets |  |  |  |  | 8,341 | 7,898 |
Defined Benefit Pension Plan [Member] | United States [Member] |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Net periodic retirement (benefit) cost |  |  |  |  | $ (2,731) | $ (2,825) | (2,660)
Discount rate support/source data |  |  |  |  | In the United States, Woodward uses a bond portfolio matching analysis based on recently traded, non-callable bonds rated AA or better that have at least $50 million outstanding to determine the benefit obligations at year end |  |
Convergence period |  |  |  |  | 5 years | 10 years |
Long term rate |  |  |  |  | 0.75 | 0.75 |
Projected benefit obligation |  |  |  |  | $ 184,077 | $ 175,595 | 150,032
Fair value of plan assets |  |  |  |  | 201,555 | 170,556 | 165,342
Accumulated benefit obligation |  |  |  |  | 184,077 |  |
Estimated future employer contributions in the next fiscal year |  |  |  |  | 0 |  |
Defined Benefit Pension Plan [Member] | Foreign Plan |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Current portion of pension obligation |  |  |  |  | 1,059 | 1,539 |
Net periodic retirement (benefit) cost |  |  |  |  | $ 2,385 | 1,587 | 161
Discount rate support/source data |  |  |  |  | In the United Kingdom, Germany and Japan, Woodward uses a high-quality corporate bond yield curve matched with separate cash flows to develop a single rate to determine the single rate equivalent to settle the entire benefit obligations in each jurisdiction. For the fiscal years ended September 30, 2020 and 2019, the discount rate used to determine periodic service cost and interest cost components of the overall benefit costs was based on spot rates derived from the same high-quality corporate bond yield curve used to determine the September 30, 2019 and 2018 benefit obligation, respectively, matched with separate cash flows for each future year |  |
Projected benefit obligation |  |  |  |  | $ 123,546 | 121,535 | 103,485
Fair value of plan assets |  |  |  |  | 65,154 | $ 63,577 | 62,380
Defined Benefit Pension Plan [Member] | United Kingdom |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Projected benefit obligation |  |  |  |  | 59,003 |  |
Fair value of plan assets |  |  |  |  | 53,557 |  |
Accumulated benefit obligation |  |  |  |  | 58,198 |  |
Estimated future employer contributions in the next fiscal year |  |  |  |  | 689 |  |
Defined Benefit Pension Plan [Member] | Japan |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Projected benefit obligation |  |  |  |  | 10,119 |  |
Fair value of plan assets |  |  |  |  | 11,597 |  |
Accumulated benefit obligation |  |  |  |  | 9,266 |  |
Estimated future employer contributions in the next fiscal year |  |  |  |  | 219 |  |
Defined Benefit Pension Plan [Member] | Germany [Member] |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Projected benefit obligation |  |  |  |  | 54,424 |  |
Fair value of plan assets |  |  |  |  | 0 |  |
Accumulated benefit obligation |  |  |  |  | 54,403 |  |
Estimated future employer contributions in the next fiscal year |  |  |  |  | $ 1,021 |  |
Defined Benefit Pension Plan [Member] | Japan And United Kingdom [Member] |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Annual improvement rate |  |  |  |  | 1.5 | 1.5 |
Other Postretirement Benefit Plans [Member] |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Current portion of pension obligation |  |  |  |  | $ 1,992 | $ 2,048 |
Net periodic retirement (benefit) cost |  |  |  |  | 834 | 1,209 | 778
Accumulated benefit obligation |  |  |  |  | $ 25,445 | $ 26,671 |
Option to elect company provided medical insurance coverage up to this age and a Medicare supplemental plan after this age | yr |  |  |  |  | 65 |  |
Age employees were eligible to participate in plan | yr |  |  |  |  | 55 |  |
Defined benefit plan, minimum years of service required for employees to be eligible for benefits |  |  |  |  | 10 years |  |
Approximate number of retired employees and their covered dependents and beneficiaries currently providing postretirement benefits |  |  |  |  | 455 |  |
Approximate number of active employees and their covered dependants and beneficiaries who may receive postretirement benefits in the future |  |  |  |  | 8 |  |
As a result of a plan amendment, all postretirement medical benefits are fully insured for retirees who have attained this age |  |  |  |  | 65 |  |
Other Postretirement Benefit Plans [Member] | United States [Member] |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Discount rate support/source data |  |  |  |  | Woodward used a bond portfolio matching analysis based on recently traded, non-callable bonds rated AA or better that have at least $50 million outstanding to determine the benefit obligations at year end |  |
Convergence period |  |  |  |  | 5 years | 10 years |
Long term rate |  |  |  |  | 0.75 | 0.75 |
Other Postretirement Benefit Plans [Member] | United Kingdom |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Discount rate support/source data |  |  |  |  | Woodward uses a high-quality corporate bond yield curve matched with separate cash flows to develop a single rate to determine the single rate equivalent to settle the entire benefit obligations in each jurisdiction |  |
Long term rate |  |  |  |  | 1.5 | 1.5 |
Woodward Retirement Savings Plan [Member] | United States [Member] |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Accumulated benefit obligation |  |  |  |  |  | $ 175,595 |
Woodward Retirement Savings Plan [Member] | United Kingdom |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Accumulated benefit obligation |  |  |  |  |  | 56,389 |
Woodward Retirement Savings Plan [Member] | Japan |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Accumulated benefit obligation |  |  |  |  |  | 10,081 |
Woodward Retirement Savings Plan [Member] | Germany [Member] |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Accumulated benefit obligation |  |  |  |  |  | 51,908 |
Business Acquisition, Acquiree - L'Orange [Member] | Defined Benefit Pension Plan [Member] |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Obligation assumed in L'Orange acquisition | $ 39,257 |  |  |  |  |  |
Current portion of pension obligation | $ 1,143 |  |  |  |  |  |
Net periodic retirement (benefit) cost |  |  |  |  | $ 3,000 | 2,004 | 673
Contributions paid |  |  |  |  | $ 873 | $ 782 | $ 219

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