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Retirement Benefits (Narrative) (Details) - USD ($) shares in Thousands	3 Months Ended	6 Months Ended
	Mar. 31, 2018	Mar. 31, 2018	Mar. 31, 2017
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
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

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Number of shares issued during the period to an employee benefit plan, such as a defined contribution or defined benefit plan.

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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.

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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.

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