Revenue from Contracts with Customers - Contract Balances (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2021	Sep. 30, 2021
Accounts Receivable, after Allowance for Credit Loss, Current [Abstract]
Accounts receivable, net	$ 126,001	$ 119,877
Contract with Customer, Asset, after Allowance for Credit Loss, Current [Abstract]
Contract assets	18,800	15,300
Contract with Customer, Liability [Abstract]
Current contract liabilities	28,483	25,724
Contract liabilities	28,500	$ 25,700
Revenue recognized	$ 13,800