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Revenue - Schedule of Contract Assets and Liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Revenue from Contract with Customer [Abstract]
Contract assets	$ 102,827	$ 60,621
Contract liabilities	(287,763)	(279,796)
Net contract liability	(184,936)	(219,175)
Revenue recognized related to contract liabilities	246,200
Retention amounts included in accounts receivable	7,100	$ 7,400
Retained amount expected to be collected in the next twelve months	6,100
Retained amount expected to be collected	$ 1,000

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