Revenue - Summary of Rebate Activity (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2023	Mar. 31, 2022
Revenue From Contract With Customer [Abstract]
Beginning balance	$ 61,066	$ 53,841	$ 56,542	$ 47,648
Rebate expense	29,703	30,402	45,419	46,552
Rebate payments	(18,028)	(44,097)	(29,220)	(54,054)
Ending balance	$ 72,741	$ 40,146	$ 72,741	$ 40,146