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Joint Venture (Narrative) (Details)
 3 Months Ended 12 Months Ended
Mar. 31, 2025
USD ($)
Mar. 31, 2024
USD ($)
Mar. 31, 2023
USD ($)
Sep. 30, 2025
USD ($)
Sep. 30, 2024
USD ($)
Sep. 30, 2023
USD ($)
Schedule Of Equity Method Investments [Line Items]            
Revenue from contract liabilities       $ 31,998,000 $ 44,398,000  
Cost of goods sold from contract assets       $ 2,610,772,000 2,447,770,000 $ 2,236,983,000
Woodward and General Electric Joint Venture [Member]            
Schedule Of Equity Method Investments [Line Items]            
Ownership interest, joint venture       50.00%    
Cash received annually from formation of joint venture $ 4,894,000 $ 4,894,000 $ 4,894,000 $ 4,894,000    
Revenue from contract liabilities       1,488,000 812,000  
Cost of goods sold from contract assets       1,488,000 1,236,000  
Reduction in contract liability and costs to fulfill contract       0 9,680,000  
Reduction in costs to fulfill a contract related to the termination       $ 0 9,680,000  
Woodward and General Electric Joint Venture [Member] | Minimum [Member]            
Schedule Of Equity Method Investments [Line Items]            
Engine thurst specification (in pounds)       50,000    
Woodward and General Electric Joint Venture [Member] | Other Liabilities [Member]            
Schedule Of Equity Method Investments [Line Items]            
Contract liabilities       $ 78,985,000 78,226,000  
Woodward and General Electric Joint Venture [Member] | Other Assets [Member]            
Schedule Of Equity Method Investments [Line Items]            
Costs to fulfill a contract       78,985,000 78,226,000  
Woodward and General Electric Joint Venture [Member] | Sales [Member]            
Schedule Of Equity Method Investments [Line Items]            
Amortization of deferred income recognized as an increase to sales       6,462,000 6,294,000 5,020,000
Reduction to sales related to royalties owed to joint venture       $ 71,030,000 $ 63,794,000 $ 49,624,000