Joint Venture (Accounts Receivable, Accounts Payable, and Other Assets Related to JV) (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Sep. 30, 2024
Schedule Of Equity Method Investments [Line Items]
Accounts receivable	$ 475,315	$ 457,234
Accounts payable	284,029	287,457
Woodward and General Electric Joint Venture [Member]
Schedule Of Equity Method Investments [Line Items]
Other assets	21,982	19,219
Woodward and General Electric Joint Venture [Member] | Related Party [Member]
Schedule Of Equity Method Investments [Line Items]
Accounts receivable	4,630	5,205
Accounts payable	$ 5,781	$ 11,378