Related Party Transactions (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Sep. 30, 2024
Related Party Transaction [Line Items]
Total revenues	$ 375,814	$ 364,013
Accounts receivable, net	56,912		$ 73,269
Accounts payable	29,266		32,106
Tax receivable agreement liability	40,600		40,600
Affiliated Entities and Individuals
Related Party Transaction [Line Items]
Total revenues	2,100	1,100
Costs and expenses, related party	200	0
Affiliated Entity
Related Party Transaction [Line Items]
Purchase of inventories	52,400	49,800
Expenses incurred	1,400	$ 700
Accounts receivable, net	0		0
Accounts payable	4,900		6,000
Tax receivable agreement liability	$ 36,200		$ 36,200