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Marketable Securities - Fair Value of Available-for-Sale Marketable Securities by Type of Security (Detail) - USD ($) $ in Thousands	Jun. 30, 2025	Sep. 30, 2024
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 159,317	$ 210,267
Gross Unrealized Gains	41	686
Gross Unrealized Losses	(59)	0
Fair Value	159,299	210,953
U.S. Treasury Notes [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	159,317	210,267
Gross Unrealized Gains	41	686
Gross Unrealized Losses	(59)	0
Fair Value	$ 159,299	$ 210,953

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