Revenue and Accounts Receivable - Schedule of Rollforward of Allowance for Doubtful Accounts (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 49,341	$ 42,705	$ 37,056	$ 40,840
Current period provisions	1,771	3,575	24,786	23,122
Write-offs charged against allowance	(5,054)	(4,407)	(17,263)	(19,023)
Recoveries of amounts previously written off	302	286	1,781	1,412
Mississippi recovery of uncollectible accounts				(4,192)
Ending balance	$ 46,360	$ 42,159	$ 46,360	$ 42,159