Revenue and Accounts Receivable - Schedule of Rollforward of Allowance for Doubtful Accounts (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023	Mar. 31, 2024	Mar. 31, 2023
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 35,406	$ 40,840	$ 47,613	$ 40,840	$ 49,993
Current period provisions	12,797		13,009	19,547	20,242
Write-offs charged against allowance	(5,859)		(8,333)	(14,616)	(18,754)
Recoveries of amounts previously written off	361		462	1,126	1,270
Mississippi recovery of uncollectible accounts				(4,192)
Ending balance	$ 42,705	$ 35,406	$ 52,751	$ 42,705	$ 52,751