Revenue from Contracts with Customers - Contract Balances (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Accounts Receivable, after Allowance for Credit Loss, Current [Abstract]
Accounts receivable, net	$ 156,535	$ 163,758
Contract with Customer, Asset, after Allowance for Credit Loss, Current [Abstract]
Contract assets	24,200	18,200
Contract with Customer, Liability [Abstract]
Contract liabilities	34,600	$ 39,700
Revenue recognized	$ 34,900