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Income Taxes - Summary of Tax Rates (Detail)	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Income Tax Disclosure [Abstract]
Federal tax provision	21.00%	21.00%	21.00%
State taxes, net of federal benefit	3.00%	3.60%	3.40%
Stock-based compensation	4.20%	(0.20%)	(0.60%)
Foreign rate differential	(2.00%)	0.20%
US tax on foreign earnings	1.50%	1.40%
Equity investment		(0.90%)
Other	1.00%	0.60%	0.60%
Effective tax rate	28.70%	25.70%	24.40%

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