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Retirement Benefits (Narrative) (Details)
$ in Thousands
 12 Months Ended
Sep. 30, 2025
USD ($)
yr
shares
Sep. 30, 2024
USD ($)
shares
Sep. 30, 2023
USD ($)
shares
Sep. 30, 2022
Defined Benefit Plan Disclosure [Line Items]        
Percentage of annual contribution equal to eligible prior year wages 5.00%      
Common shares issued from treasury to settle benefit obligations $ 24,912 $ 21,889 $ 19,466  
Shares of woodward stock held in woodward retirement savings plan | shares 2,085,000 2,222,000    
Accrued liabilities $ 22,010 $ 19,532    
Treasury Stock [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Common shares issued from treasury to settle benefit obligations 6,534 7,922 8,523  
Common shares issued from treasury to settle benefit obligations $ 24,058 $ 21,889 $ 19,466  
Common shares issued from treasury stock for benefit plans, shares | shares 131,000 159,000 188,000  
Common shares issued from treasury stock for benefit plans, shares | shares 126,000 159,000 188,000  
Defined Benefit Pension Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Current portion of pension obligation $ 1,372 $ 1,166    
Projected benefit obligation 212,235 218,302 $ 194,485  
Fair value of plan assets 235,141 237,393 206,145  
Defined Benefit Pension Plan [Member] | Cash and Cash Equivalents        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets $ 13,513 5,500    
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   12,049    
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   14,924    
Defined Benefit Pension Plan [Member] | United States [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Discount rate support/source data In the United States, 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      
Convergence period 5 years      
Long term rate 0.75      
Projected benefit obligation $ 133,608 140,955 127,222  
Fair value of plan assets 178,583 179,917 155,370  
Accumulated benefit obligation 133,608      
Estimated future employer contributions in the next fiscal year 433      
Defined Benefit Pension Plan [Member] | Foreign Plan        
Defined Benefit Plan Disclosure [Line Items]        
Current portion of pension obligation $ 1,372 1,166    
Discount rate support/source data In the United Kingdom, Germany, and Japan, 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, 2025 and 2024, 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, 2024 and 2023 benefit obligation, respectively, matched with separate cash flows for each future year      
Projected benefit obligation $ 78,627 77,347 67,263  
Fair value of plan assets 56,558 57,476 50,775  
Defined Benefit Pension Plan [Member] | United Kingdom        
Defined Benefit Plan Disclosure [Line Items]        
Projected benefit obligation 36,377      
Fair value of plan assets 47,208      
Accumulated benefit obligation 35,912      
Estimated future employer contributions in the next fiscal year 305      
Defined Benefit Pension Plan [Member] | Japan        
Defined Benefit Plan Disclosure [Line Items]        
Projected benefit obligation 6,246      
Fair value of plan assets 9,350      
Accumulated benefit obligation 5,280      
Estimated future employer contributions in the next fiscal year 150      
Defined Benefit Pension Plan [Member] | Germany [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Projected benefit obligation 36,004      
Fair value of plan assets 0      
Accumulated benefit obligation 36,004      
Estimated future employer contributions in the next fiscal year $ 1,386      
Defined Benefit Pension Plan [Member] | Japan And United Kingdom [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Annual improvement rate 1.5      
Other Postretirement Benefit Plans [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Current portion of pension obligation $ 1,576 1,668    
Net periodic retirement (benefit) cost 276 347 410  
Projected benefit obligation 14,193 15,203 $ 15,336  
Accumulated benefit obligation $ 14,193 15,203    
Option to elect company provided medical insurance coverage up to this age and a Medicare supplemental plan after this age | yr 65      
Age employees were eligible to participate in plan | yr 55      
Defined benefit plan, minimum years of service required for employees to be eligible for benefits       10 years
Approximate number of retired employees and their covered dependents and beneficiaries currently providing postretirement benefits 3      
Approximate number of active employees and their covered dependants and beneficiaries who may receive postretirement benefits in the future 304      
As a result of a plan amendment, all postretirement medical benefits are fully insured for retirees who have attained this age 65      
Other Postretirement Benefit Plans [Member] | United States [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 5 years      
Long term rate 0.75      
Woodward Retirement Savings Plan [Member] | United States [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Accumulated benefit obligation   140,955    
Woodward Retirement Savings Plan [Member] | United Kingdom        
Defined Benefit Plan Disclosure [Line Items]        
Accumulated benefit obligation   33,766    
Woodward Retirement Savings Plan [Member] | Japan        
Defined Benefit Plan Disclosure [Line Items]        
Accumulated benefit obligation   5,958    
Woodward Retirement Savings Plan [Member] | Germany [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Accumulated benefit obligation   $ 36,380