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Income Taxes - Summary of Tax Rates (Detail)	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Income Tax Disclosure [Abstract]
Federal tax provision	21.00%	21.00%	21.00%
State taxes, net of federal benefit	0.20%	3.00%	3.60%
Stock-based compensation	(4.90%)	4.20%	(0.20%)
Foreign rate differential	(2.60%)	(2.00%)	0.20%
US tax on foreign earnings	4.10%	1.50%	1.40%
Equity investment			(0.90%)
Entity classification change	13.20%
Goodwill impairment	(16.30%)
R&D Credits	1.50%
Other	1.00%	1.00%	0.60%
Effective tax rate	17.20%	28.70%	25.70%

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