Revenue From Contracts With Customers - Reconciliation of Contract Balances (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Sep. 30, 2020
Contract with Customer, Liability [Abstract]
Contract liabilities (current)	$ 8,150		$ 8,501
Contract liabilities (noncurrent)	1,476		$ 1,288
Change in Contract with Customer, Liability [Abstract]
Revenue recognized in contract liability	$ 2,453	$ 2,258