Accounts Receivable, Net - Allowance for Expected Credit Losses Activity (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Jun. 30, 2023	Sep. 30, 2022
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	$ 5,162	$ 4,318
Provisions	6,963	3,536
Reversals of bad debt expense	(3,652)	(2,278)
Write-offs and adjustments	(70)	(414)
Balance at end of period	$ 8,403	$ 5,162