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Retirement Benefits (Narrative) (Details) shares in Thousands, $ in Thousands |  | 12 Months Ended
--- | --- | ---
Jun. 01, 2018 USD ($) | Sep. 30, 2019 USD ($) item shares | Sep. 30, 2018 USD ($) item shares | Sep. 30, 2017 USD ($) 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 |  | $ 14,846 | $ 14,741 | $ 14,014
Common shares issued from treasury stock for benefit plans, shares | shares |  | 158 | 202 | 199
Shares of Woodward stock held in Woodward Retirement Savings Plan | shares |  | 3,623 | 3,955 |
Accrued liabilities |  | $ 11,701 | $ 11,475 |
Treasury Stock at Cost [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Common shares issued from treasury stock for benefit plans |  | $ 5,673 | $ 7,584 | $ 7,513
Common shares issued from treasury stock for benefit plans, shares | shares |  | 158 | 202 | 199
Defined Benefit Pension Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
UK High Court Ruling Amendment |  | $ 601 |  |
Projected benefit obligation |  | 297,130 | 253,517 | $ 227,499
Fair value of plan assets |  | 234,133 | 227,722 | 224,712
Obligation assumed in L'Orange aquisition |  |  | 39,257 |
Current portion of pension obligation |  | 1,539 | 1,322 |
Net periodic retirement (benefit) cost |  | (1,238) | (2,499) | (610)
Defined Benefit Pension Plan [Member] | Cash and Cash Equivalents [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 2,986 | 3,225 |
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 |  | 5,491 | 4,913 |
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 |  | 7,898 | 6,817 |
Defined Benefit Pension Plan [Member] | Mutual funds: U.S. corporate bond fund [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 64,514 | 54,699 |
Defined Benefit Pension Plan [Member] | Pooled funds: Index linked U.K. corporate bonds fund [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 16,737 | 16,121 |
Defined Benefit Pension Plan [Member] | Pooled funds: Japanese fixed income securities [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 4,915 | 4,968 |
Defined Benefit Pension Plan [Member] | Pooled funds: International fixed income securities [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 1,710 | 1,730 |
Defined Benefit Pension Plan [Member] | Mutual funds: U.S. equity large cap fund [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 56,829 | 60,176 |
Defined Benefit Pension Plan [Member] | Mutual funds: International equity large cap growth fund [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 46,645 | 47,559 |
Defined Benefit Pension Plan [Member] | Pooled funds: Japanese equity securities [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 2,518 | 2,506 |
Defined Benefit Pension Plan [Member] | Pooled funds: International equity securities [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 2,226 | 2,214 |
Defined Benefit Pension Plan [Member] | Pooled funds: Index linked U.K. equity fund [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 3,738 | 4,326 |
Defined Benefit Pension Plan [Member] | Pooled funds: Index linked international equity fund [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 5,438 | 5,973 |
Defined Benefit Pension Plan [Member] | Business Acquisition, Acquiree - L'Orange [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Obligation assumed in L'Orange aquisition | $ 39,257 |  |  |
Current portion of pension obligation | $ 1,143 |  |  |
Net periodic retirement (benefit) cost |  | 2,004 | 673 |
Contributions paid |  | 782 | 219 |
Other Postretirement Benefit Plans [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Accumulated benefit obligation |  | $ 26,671 | 27,985 |
Option to elect company provided medical insurance coverage up to this age and a Medicare supplemental plan after this age | item |  | 65 |  |
Age employees were eligible to participate in plan | item |  | 55 |  |
Approximate number of retired employees and their covered dependents and beneficiaries currently providing postretirement benefits |  | 695 |  |
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 |  |
Projected benefit obligation |  | $ 26,671 | 27,985 | 32,252
Fair value of plan assets |  |  |  |
Current portion of pension obligation |  | 2,048 | 2,249 |
Net periodic retirement (benefit) cost |  | $ 1,209 | 778 | 1,301
Other Postretirement Benefit Plans [Member] | Minimum [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Years of service required to be eligible to participate in plan |  | 10 years |  |
United States [Member] | Woodward Retirement Savings Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Accumulated benefit obligation |  |  | 150,032 |
United States [Member] | Defined Benefit Pension Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
UK High Court Ruling Amendment |  |  |  |
Discount rate support/source data |  | 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. |  |
Accumulated benefit obligation |  | $ 175,595 |  |
Projected benefit obligation |  | 175,595 | 150,032 | 161,130
Fair value of plan assets |  | 170,556 | 165,342 | 160,332
Obligation assumed in L'Orange aquisition |  |  |  |
Net periodic retirement (benefit) cost |  | $ (2,825) | $ (2,660) | (860)
Convergence period |  | 10 years | 10 years |
Long-term rate | item |  | 0.75 | 0.75 |
United States [Member] | Other Postretirement Benefit Plans [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 |  | 10 years | 10 years |
Long-term rate | item |  | 0.75 | 0.75 |
Other Countries [Member] | Defined Benefit Pension Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
UK High Court Ruling Amendment |  | $ 601 |  |
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. For the fiscal years ended September 30, 2019 and 2018, 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, 2018 and 2017 benefit obligation, respectively, matched with separate cash flows for each future year. |  |
Projected benefit obligation |  | $ 121,535 | 103,485 | 66,369
Fair value of plan assets |  | 63,577 | 62,380 | 64,380
Obligation assumed in L'Orange aquisition |  |  | 39,257 |
Current portion of pension obligation |  | 1,539 | 1,322 |
Net periodic retirement (benefit) cost |  | 1,587 | 161 | $ 250
United Kingdom |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Estimated future employer contributions in the next fiscal year |  | 657 |  |
Fair value of plan assets |  | 52,105 |  |
United Kingdom | Woodward Retirement Savings Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Accumulated benefit obligation |  |  | $ 50,594 |
United Kingdom | Defined Benefit Pension Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
UK High Court Ruling Amendment |  | 601 |  |
Accumulated benefit obligation |  | 56,389 |  |
Projected benefit obligation |  | $ 58,494 |  |
United Kingdom | Other Postretirement Benefit Plans [Member] |  |  |  |
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. |  |
Annual improvement rate | item |  | 1.5 | 1.5 |
Japan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Estimated future employer contributions in the next fiscal year |  | $ 234 |  |
Fair value of plan assets |  | 11,472 |  |
Japan | Woodward Retirement Savings Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Accumulated benefit obligation |  |  | $ 9,975 |
Japan | Defined Benefit Pension Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Accumulated benefit obligation |  | 10,081 |  |
Projected benefit obligation |  | 11,110 |  |
Germany [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Estimated future employer contributions in the next fiscal year |  | 1,061 |  |
Germany [Member] | Woodward Retirement Savings Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Accumulated benefit obligation |  |  | $ 40,358 |
Germany [Member] | Defined Benefit Pension Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Accumulated benefit obligation |  | 51,908 |  |
Projected benefit obligation |  | $ 51,931 |  |
Japan And United Kingdom [Member] | Defined Benefit Pension Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Annual improvement rate | item |  | 1.5 | 1.5 |

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- Definition Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 6: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition As the result of a plan amendment in fiscal year 2009, all the postretirement medical plans are fully insured for retirees who have attained this age. + References No definition available. + Details
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