Contingencies - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024
Loss Contingencies [Line Items]
Standard product warranty length, minimum	1 year
Standard product warranty length, maximum	2 years
Limited product warranty length (up to)	10 years
Litigation accruals	$ 9,930	$ 9,297
Performance Bonds
Loss Contingencies [Line Items]
Letters of credit secured using cash collateral	41,400
Outstanding performance bonds	321,900
Surety-backed letters of credit	$ 2,400