Revenue - Summary of Rebate Activity (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Revenue From Contract With Customer [Abstract]
Beginning balance	$ 40,146	$ 27,791	$ 47,648	$ 32,679
Rebate expense	23,631	20,645	70,184	54,857
Rebate payments	(14,380)	(12,257)	(68,435)	(51,357)
Ending balance	$ 49,397	$ 36,179	$ 49,397	$ 36,179