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Property and Equipment, Net - Schedule of Property and Equipment, Net (Detail) - USD ($) $ in Thousands	Jun. 30, 2025	Sep. 30, 2024
Property, Plant and Equipment [Line Items]
Property and equipment	$ 59,138	$ 57,735
Less: Accumulated depreciation and amortization	(22,521)	(25,047)
Property and equipment, net	36,617	32,688
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment	36,823	13,975
Laboratory and Office Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment	16,092	15,701
Furniture [Member]
Property, Plant and Equipment [Line Items]
Property and equipment	3,404	3,117
Computer Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment	859	1,101
Purchased Software [Member]
Property, Plant and Equipment [Line Items]
Property and equipment	615	1,093
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Property and equipment	$ 1,345	$ 22,748

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Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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