Revenue from Contracts with Customers - Contract Balances (Details) - USD ($) $ in Thousands	6 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Sep. 30, 2023
Accounts Receivable, after Allowance for Credit Loss, Current [Abstract]
Accounts receivable, net	$ 154,668		$ 156,535
Contract with Customer, Asset, after Allowance for Credit Loss, Current [Abstract]
Contract assets	33,300		24,200
Contract with Customer, Liability [Abstract]
Contract liabilities	38,300		$ 34,600
Revenue recognized	$ 20,100	$ 22,400