Revenue and Accounts Receivable - Schedule of Rollforward of Allowance for Doubtful Accounts (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 42,705	$ 52,751	$ 40,840	$ 49,993
Current period provisions	3,575	1,758	23,122	22,000
Write-offs charged against allowance	(4,407)	(5,902)	(19,023)	(24,656)
Recoveries of amounts previously written off	286	294	1,412	1,564
Mississippi recovery of uncollectible accounts			(4,192)
Ending balance	$ 42,159	$ 48,901	$ 42,159	$ 48,901