Revenue and Accounts Receivable - Schedule of Rollforward of Allowance for Doubtful Accounts (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 37,056	$ 40,840
Current period provisions	8,623	6,750
Write-offs charged against allowance	(7,447)	(8,757)
Recoveries of amounts previously written off	934	765
Mississippi recovery of uncollectible accounts		(4,192)
Ending balance	$ 39,166	$ 35,406