Revenue - Contract Balances (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024
Change In Contract With Customer, Assets [Roll Forward]
Contract assets - Beginning balance	$ 10,745	$ 10,091
Additional revenue recognized over-time	52,785	42,697
Less amounts billed to the customers	(52,970)	(42,043)
Contract assets - Ending balance	10,560	10,745
Change In Contract With Customer, Liability [Roll Forward]
Contract liabilities - Beginning balance	(2,879)	(731)
Payments received in advance of performance obligations	(3,773)	(5,737)
Performance obligations satisfied	4,868	3,589
Contract liabilities - Ending balance	$ (1,784)	$ (2,879)