Revenue and Accounts Receivable - Schedule of Rollforward of Allowance for Doubtful Accounts (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 40,840	$ 49,993
Current period provisions	6,750	7,233
Write-offs charged against allowance	(8,757)	(10,421)
Recoveries of amounts previously written off	765	808
Mississippi recovery of uncollectible accounts	(4,192)
Ending balance	$ 35,406	$ 47,613