Other Balance Sheet Information - Allowance for Expected Credit Losses Activity (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	$ 5,162	$ 4,318
Provisions	2,716	3,020
Reversals of bad debt expense	(936)	(2,924)
Balance at end of period	$ 6,942	$ 4,414