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Long-term Debt (Narrative) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended | 3 Months Ended | 12 Months Ended |  | 12 Months Ended | 6 Months Ended | 12 Months Ended | 6 Months Ended |  | 3 Months Ended | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended
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Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2014 The Notes [Member] | Sep. 30, 2014 Non Floating Rate Notes [Member] | Sep. 30, 2014 2008 Note Purchase Agreement [Member] | Sep. 30, 2014 2009 Note Purchase Agreement [Member] | Dec. 31, 2013 2013 Note Purchase Agreement [Member] | Sep. 30, 2014 2013 Note Purchase Agreement [Member] | Sep. 30, 2014 Floating Rate Notes [Member] | Sep. 30, 2014 Series J Notes [Member] | Sep. 30, 2014 First Closing Notes [Member] | Sep. 30, 2014 Second Closing Notes [Member] | Mar. 31, 2013 2008 Term Loan [Member] | Sep. 30, 2013 2008 Term Loan [Member] | Mar. 31, 2013 2008 Term Loan [Member] Minimum [Member] | Mar. 31, 2013 2008 Term Loan [Member] Maximum [Member] | Sep. 30, 2014 Foreign Performance Guarantee Facilities [Member] | Sep. 30, 2014 Foreign Lines of Credit And Overdraft Facilities [Member] | Dec. 31, 2013 Domestic Line Of Credit [Member] | Sep. 30, 2013 Domestic Line Of Credit [Member] | Sep. 30, 2014 Revolving Credit Facility [Member] | Sep. 30, 2014 Chinese Credit Facility [Member] | Sep. 30, 2014 Chinese Credit Facility, RMB Denominated Loan [Member] | Sep. 30, 2014 | Sep. 30, 2014 Revolving Credit Agreement [Member] | Sep. 30, 2013 Revolving Credit Agreement [Member] | Sep. 30, 2014 Revolving Credit Agreement [Member] Minimum [Member] | Sep. 30, 2014 Revolving Credit Agreement [Member] Maximum [Member]
Issuance Date |  |  |  |  |  | Oct. 01, 2008 | Apr. 01, 2009 | Oct. 01, 2013 |  |  |  | Oct. 01, 2013 | Nov. 15, 2013 |  | Oct. 01, 2008 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face Amount |  |  |  |  |  |  |  | $ 250,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Variable Rate Basis |  |  |  |  |  |  |  |  |  |  |  |  |  | LIBOR |  |  |  |  |  |  | prime rate or an adjusted LIBOR |  |  | interest at the prevailing interest rate offered by the People's Bank of China on the date of borrowing, plus a margin equal to 25% of that prevailing rate | interest at the lender's cost of borrowing rate at the date of borrowing, plus 3% | LIBOR |  |  |
Basis Spread On Variable Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.00% | 2.25% |  |  |  |  |  |  |  |  |  |  | 0.85% | 1.65%
Variable interest rate |  |  |  |  |  |  |  |  |  |  | 1.49% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Covenant, Leverage Ratio, Maximum |  |  |  | 3.5 to 1.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.5 to 1.0 |  |  |
Debt Covenant, Minimum Consolidated Net Worth Calculation, Base Value |  |  |  | 800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 800,000 |  |  |
Debt Covenant, Minimum Consolidated Net Worth Calculation, Percentage of Net Income |  |  |  | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |
Debt Covenant, Minimum Consolidated Net Worth Calculation, Percentage of Net Proceeds of Issuance of Capital Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |
Debt Covenant, Calculations, Period Of Time |  |  |  | rolling four quarter basis |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cross default provisions related to the Company’s other outstanding debt arrangements in excess of this amount, the occurrence of which would permit the lenders to accelerate the amounts due thereunder |  |  |  | 60,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Covenant, Leverage Ratio During Material Acquisition Period, Maximum |  |  |  | 4.0 to 1.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.0 to 1.0 |  |  |
Debt Covenant, Maximum Percentage of Priority Debt To Consolidated Net Worth |  |  |  | 25.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Prepayment, Maximum Percentage of Principal |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Prepayment, Partial Payment Minimum |  |  |  | 1,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Prepayment, Make-Whole Amount Computation, Discount Rate Basis Points |  |  |  |  | 50 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument Prepayment Make Whole Amount Computation |  |  |  |  | discounting the remaining scheduled payments of interest and principal of the Notes being prepaid at a discount rate equal to the sum of 50 basis points and the yield to maturity of U.S. Treasury securities having a maturity equal to the remaining average life of the Notes being prepaid. |  |  |  |  | computed as a percentage of the principal amount of such floating rate Notes equal to (a) 2%, on or prior to November 15, 2014, (b) 1%, after November 15, 2014 and on or prior to November 15, 2015, and (c) 0% after November 15, 2015. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt financing costs | 1,297 | 1,651 | 2,185 |  |  |  |  |  | 1,297 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of debt financing costs recognized as interest expense | 1,014 | 1,045 | 1,074 |  |  |  |  |  |  |  |  |  |  | 128 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance of unamortized debt financing costs | 4,276 | 3,869 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Initiation Date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Dec. 21, 2012 |  |  |  |  |  |  |  |
Line of Credit Facility, Expiration Date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Dec. 20, 2013 |  |  |  |  |  | Jul. 01, 2018 |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | 637,637 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9,678 | 27,959 |  | 200,000 | 600,000 | 22,700 |  |  | 600,000 |  |  |
Outstanding borrowings | $ 210,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 0 |  |  | $ 210,000 | $ 0 |  |  | $ 210,000 | $ 0 |  |
Credit facility effective interest rate on outstanding borrowing |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.21% |  |  |
Line of Credit Facility, Rationale for Classification as Long-term Debt |  | Woodward classified the $200,000 outstanding on the Line of Credit as long-term as of September 30, 2013 based on its intention to refinance in fiscal year 2014 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Woodward classified the $200,000 outstanding on the Line of Credit as long-term as of September 30, 2013 based on its intention to refinance in fiscal year 2014. |  |  |  |  |  |  |  |

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