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Income Taxes - Summary of Tax Rates (Detail)	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Income Tax Disclosure [Abstract]
Federal tax provision	21.00%	21.00%	21.00%
State taxes, net of federal benefit	3.60%	3.40%	3.70%
Stock-based compensation	(0.20%)	(0.60%)	(0.70%)
Foreign rate differential	0.20%		0.10%
US tax on foreign earnings	1.40%
Equity Investment	(0.90%)
Other	0.60%	0.60%	0.60%
Effective tax rate	25.70%	24.40%	24.70%

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