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Credit Facilities, Short-term Borrowings and Long-term Debt (Narrative) (Details) $ in Thousands |  | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Nov. 15, 2020 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2020 EUR (€) | Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2020 EUR (€) | May 31, 2018 USD ($) | Sep. 23, 2016 EUR (€) | Oct. 01, 2013 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  | $ 1,008,078 |  |  |  |  |  |  |
Short-term borrowings |  |  |  | $ 220,000 |  |  |  |  |
Amortization of debt financing costs recognized as interest expense |  | 892 |  | 1,094 | $ 1,256 |  |  |  |
Unamortized debt issuance costs |  | $ 2,171 |  | 2,478 |  |  |  |  |
The Notes [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Covenant Description |  | The Notes contain restrictive covenants customary for such financings, including, among other things, covenants that place limits on Woodward’s ability to incur liens on assets, incur additional debt (including a leverage or coverage based maintenance test), transfer or sell Woodward’s assets, merge or consolidate with other persons and enter into material transactions with affiliates. Under the financial covenants contained in the note purchase agreement governing each series of the Notes, Woodward’s priority debt may not exceed, at any time, 25% of its consolidated net worth. Woodward’s Leverage Ratio cannot exceed 4.0 to 1.0 during any material acquisition period, or 3.5 to 1.0 at any other time on a rolling four quarter basis. In the event that Woodward’s Leverage Ratio exceeds 3.5 to 1.0 during any material acquisition period, the interest rate on each series of Notes will increase. For the Series G, H, I, J, K, L, M, N, and O notes, Woodward’s consolidated net worth must at all times equal or exceed $1,156,000 plus 50% of Woodward’s positive net income for each completed fiscal year beginning with the fiscal year ending September 30, 2016. For the 2018 Notes, Woodward’s consolidated net worth must at all times equal or exceed $1,156,000 plus (i) 50% of Woodward’s positive net income for each completed fiscal year beginning with the fiscal year ending September 30, 2018 and (ii) 50% of the net cash proceeds received by Woodward on or after May 31, 2018 from the issuance of capital stock, other than issuances pursuant to employee stock option or ownership plans. | The Notes contain restrictive covenants customary for such financings, including, among other things, covenants that place limits on Woodward’s ability to incur liens on assets, incur additional debt (including a leverage or coverage based maintenance test), transfer or sell Woodward’s assets, merge or consolidate with other persons and enter into material transactions with affiliates. Under the financial covenants contained in the note purchase agreement governing each series of the Notes, Woodward’s priority debt may not exceed, at any time, 25% of its consolidated net worth. Woodward’s Leverage Ratio cannot exceed 4.0 to 1.0 during any material acquisition period, or 3.5 to 1.0 at any other time on a rolling four quarter basis. In the event that Woodward’s Leverage Ratio exceeds 3.5 to 1.0 during any material acquisition period, the interest rate on each series of Notes will increase. For the Series G, H, I, J, K, L, M, N, and O notes, Woodward’s consolidated net worth must at all times equal or exceed $1,156,000 plus 50% of Woodward’s positive net income for each completed fiscal year beginning with the fiscal year ending September 30, 2016. For the 2018 Notes, Woodward’s consolidated net worth must at all times equal or exceed $1,156,000 plus (i) 50% of Woodward’s positive net income for each completed fiscal year beginning with the fiscal year ending September 30, 2018 and (ii) 50% of the net cash proceeds received by Woodward on or after May 31, 2018 from the issuance of capital stock, other than issuances pursuant to employee stock option or ownership plans. |  |  |  |  |  |
Percent of debt not exceed net worth |  | 25.00% | 25.00% |  |  |  |  |  |
Percent of the principal amount |  | 100.00% | 100.00% |  |  |  |  |  |
Unamortized debt issuance costs |  | $ 2,171 |  | 2,478 |  |  |  |  |
The Notes [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Leverage ratio |  | 3.5 |  |  |  | 3.5 |  |  |
The Notes [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Leverage ratio |  | 4.0 |  |  |  | 4.0 |  |  |
Amended And Restated Revolving Credit Agreement [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Line of Credit Facility, Percentage of Positive Net Income as Part of Amended and Restated Revolving Credit Agreement |  | 50.00% | 50.00% |  |  |  |  |  |
Line Of Credit Facility, Percentage of Net Cash Proceeds as Part of Amended And Restated |  | 50.00% | 50.00% |  |  |  |  |  |
Line Of Credit Facility, Minimum Consolidated Net Worth Covenant |  | $ 1,156,000 |  |  |  |  |  |  |
Debt Instrument, Covenant Description |  | The Revolving Credit Agreement contains certain covenants customary with such agreements, which are generally consistent with the covenants applicable to Woodward’s long-term debt agreements, and contains customary events of default, including certain cross default provisions related to Woodward’s other outstanding debt arrangements in excess of $60,000, the occurrence of which would permit the lenders to accelerate the amounts due thereunder. In addition, the Revolving Credit Agreement includes the following financial covenants: (i) a maximum permitted leverage ratio of consolidated net debt to consolidated earnings before interest, taxes, depreciation, stock-based compensation, and amortization, plus any usual non-cash charges to the extent deducted in computing net income and transaction costs associated with permitted acquisitions (incurred within six-months of the permitted acquisition), minus any usual non-cash gains to the extent added in computing net income (“Leverage Ratio”) for Woodward and its consolidated subsidiaries of 3.5 to 1.0, which ratio, subject to certain restrictions, may increase to 4.0 to 1.0 for each period of four consecutive quarters during which a permitted acquisition occurs, and (ii) a minimum consolidated net worth of $1,156,000 plus (a) 50% of Woodward’s positive net income for the prior fiscal year and (b) 50% of Woodward’s net cash proceeds resulting from certain issuances of stock, subject to certain adjustments. | The Revolving Credit Agreement contains certain covenants customary with such agreements, which are generally consistent with the covenants applicable to Woodward’s long-term debt agreements, and contains customary events of default, including certain cross default provisions related to Woodward’s other outstanding debt arrangements in excess of $60,000, the occurrence of which would permit the lenders to accelerate the amounts due thereunder. In addition, the Revolving Credit Agreement includes the following financial covenants: (i) a maximum permitted leverage ratio of consolidated net debt to consolidated earnings before interest, taxes, depreciation, stock-based compensation, and amortization, plus any usual non-cash charges to the extent deducted in computing net income and transaction costs associated with permitted acquisitions (incurred within six-months of the permitted acquisition), minus any usual non-cash gains to the extent added in computing net income (“Leverage Ratio”) for Woodward and its consolidated subsidiaries of 3.5 to 1.0, which ratio, subject to certain restrictions, may increase to 4.0 to 1.0 for each period of four consecutive quarters during which a permitted acquisition occurs, and (ii) a minimum consolidated net worth of $1,156,000 plus (a) 50% of Woodward’s positive net income for the prior fiscal year and (b) 50% of Woodward’s net cash proceeds resulting from certain issuances of stock, subject to certain adjustments. |  |  |  |  |  |
Amended And Restated Revolving Credit Agreement [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Outstanding borrowings |  | $ 60,000 |  |  |  |  |  |  |
Leverage ratio |  | 3.5 |  |  |  | 3.5 |  |  |
Amended And Restated Revolving Credit Agreement [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Leverage ratio |  | 4.0 |  |  |  | 4.0 |  |  |
2013 Note Purchase Agreement [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Face amount |  |  |  |  |  |  |  |  | $ 250,000
2016 Note Purchase Agreements [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Face amount | € |  |  |  |  |  | € 160,000,000 |  | € 160,000,000 |
Debt Discount Rate |  | 50.00% | 50.00% |  |  |  |  |  |
2016 Note Purchase Agreements [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Periodic Payment, Principal | € |  |  | € 1,000,000 |  |  |  |  |  |
Series M Notes [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Face amount | € |  |  |  |  |  | € 40,000,000 |  | 40,000,000 |
Series N Notes [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Face amount | € |  |  |  |  |  |  |  | 77,000,000 |
Series M Notes [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Face amount | € |  |  |  |  |  |  |  | € 43,000,000 |
2018 Note Purchase Agreement [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Face amount |  |  |  |  |  |  | $ 400,000 |  |
Minimum Consolidated Net Worth Convenant |  | $ 1,156,000 |  |  |  |  |  |  |
Percent Positive Net Income |  | 50.00% | 50.00% |  |  |  |  |  |
Series P Notes [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Face amount |  |  |  |  |  |  | 85,000 |  |
Series P Notes [Member] | Cross Currency Interest Rate Swaps [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Effective interest rate |  | 1.82% |  |  |  | 1.82% |  |  |
Series Q Notes [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Face amount |  |  |  |  |  |  | 85,000 |  |
Series Q Notes [Member] | Cross Currency Interest Rate Swaps [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Effective interest rate |  | 2.15% |  |  |  | 2.15% |  |  |
Series R Notes [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Face amount |  |  |  |  |  |  | 75,000 |  |
Series R Notes [Member] | Cross Currency Interest Rate Swaps [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Effective interest rate |  | 2.42% |  |  |  | 2.42% |  |  |
Series S Notes [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Face amount |  |  |  |  |  |  | 75,000 |  |
Series S Notes [Member] | Cross Currency Interest Rate Swaps [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Effective interest rate |  | 2.55% |  |  |  | 2.55% |  |  |
Series T Notes [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Face amount |  |  |  |  |  |  | $ 80,000 |  |
Series T Notes [Member] | Cross Currency Interest Rate Swaps [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Effective interest rate |  | 2.90% |  |  |  | 2.90% |  |  |
Series J Notes [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Effective interest rate |  | 1.52% |  |  |  | 1.52% |  |  |
Percent of debt not exceed net worth |  | 0.00% | 0.00% |  |  |  |  |  |
Series G H I J K L M N And O Notes [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Minimum Consolidated Net Worth Convenant |  | $ 1,156,000 |  |  |  |  |  |  |
Percent Positive Net Income |  | 50.00% | 50.00% |  |  |  |  |  |
USD Notes And 2018 Notes [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Periodic Payment, Principal |  | $ 1,000 |  |  |  |  |  |  |
Swapped Notes [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt Discount Rate |  | 50.00% | 50.00% |  |  |  |  |  |
Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  | $ 1,000,000 |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity extension |  | 1,500,000 |  |  |  |  |  |  |
Outstanding borrowings |  | $ 0 |  | $ 262,297 |  |  |  |  |
Effective interest rate |  | 3.01% |  | 3.01% |  | 3.01% |  |  |
Short-term borrowings |  | $ 0 |  | $ 220,000 |  |  |  |  |
Revolving Credit Facility [Member] | Minimum [Member] | LIBOR [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  | 0.875% | 0.875% |  |  |  |  |  |
Revolving Credit Facility [Member] | Maximum [Member] | LIBOR [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  | 1.75% | 1.75% |  |  |  |  |  |
Revolving Credit Facility [Member] | Series G and J Notes [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Short-term borrowings | $ 100,000 |  |  |  |  |  |  |  |
Foreign Lines Of Credit And Overdraft Facilities [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  | $ 7,567 |  |  |  |  |  |  |
Short-term borrowings |  | 0 |  | 0 |  |  |  |  |
Revolving Credit Agreement [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Balance of unamortized debt issuance costs, line of credit |  | $ 2,242 |  | $ 2,840 |  |  |  |  |

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- Definition Ratio of Tier 1 risk-based capital to total leverage exposure as defined by regulatory framework. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826 + Details
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