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Retirement Benefits (Narrative) (Details) - USD ($) shares in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Jun. 01, 2018
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Value of Company Stock Contributed to Defined Contribution Benefit Plans |  |  | $ 14,741,000 | $ 14,014,000 |
Treasury Stock Issued During Period, Shares, Employee Benefit Plans |  |  | 202 | 199 |
Total stockholders equity |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Value of Company Stock Contributed to Defined Contribution Benefit Plans |  |  | $ 14,741,000 | $ 14,014,000 |
Treasury Stock at Cost [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Value of Company Stock Contributed to Defined Contribution Benefit Plans |  |  | $ 7,584,000 | $ 7,513,000 |
Treasury Stock Issued During Period, Shares, Employee Benefit Plans |  |  | 202 | 199 |
Defined Benefit Pension Plan [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Contributions paid - pensions | $ 227,000 | $ 99,000 | $ 658,000 | $ 565,000 |
Net periodic retirement (benefit) cost | (626,000) | (244,000) | (2,215,000) | (729,000) |
Defined Benefit Pension Plan [Member] | Business Acquisition, Acquiree - L'Orange [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Pension obligation assumed in L'Orange aquisition |  |  | 38,998,000 |  |
Current portion of pension obligation |  |  |  |  | $ 1,143,000
Contributions paid - pensions |  |  | 54,000 |  |
Net periodic retirement (benefit) cost |  |  | 168,000 |  |
Other Postretirement Benefit Plans [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Net periodic retirement (benefit) cost | 276,000 | 325,000 | 502,000 | 976,000 |
UNITED STATES | Defined Benefit Pension Plan [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Contributions paid - pensions | 0 | 0 | 0 | 0 |
Net periodic retirement (benefit) cost | (666,000) | (215,000) | (1,995,000) | (645,000) |
Duarte Plan, Defined Benefit [Member] | Defined Benefit Pension Plan [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit, Lump Sum Buyout Benefits Paid, Current Year |  |  |  | 670,000 |
Defined Benefit, Lump Sum Buyout Benefits Paid, Expected |  |  | 0 |  |
Foreign Plan [Member] | Defined Benefit Pension Plan [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Contributions paid - pensions | 227,000 | 99,000 | 658,000 | 565,000 |
Net periodic retirement (benefit) cost | $ 40,000 | $ (29,000) | $ (220,000) | $ (84,000) |

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- Definition Amount of increase in benefit obligation of defined benefit plan from business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(8) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of net periodic benefit cost (credit) for defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of liability, recognized in statement of financial position, for defined benefit pension and other postretirement plans, classified as current. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64852052&loc=d3e1731-114919 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(20)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64852052&loc=d3e1703-114919 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of payment for pension benefits. Excludes other postretirement benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3536-108585 + Details
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- Definition During the third quarter of fiscal year 2016, Woodward opened a lump-sum buy-out window for certain former U.S. employees and/or their dependents eligible to receive postretirement defined benefit pension payments for past employment services to the Company. Eligible pension plan participants may elect to receive a one-time lump-sum payment or an immediate annuity in lieu of future pension benefit payments. Amount represents the pension benefit payments under the lump-sum buy-out options during the fourth quarter of fiscal year 2016. + References No definition available. + Details
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- Definition During the third quarter of fiscal year 2016, Woodward opened a lump-sum buy-out window for certain former U.S. employees and/or their dependents eligible to receive postretirement defined benefit pension payments for past employment services to the Company. Eligible pension plan participants may elect to receive a one-time lump-sum payment or an immediate annuity in lieu of future pension benefit payments. Amount represents the estimated pension benefit payments under the lump-sum buy-out options expected to be paid in 2017. + References No definition available. + Details
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