Segments - Schedule of Revenues by Major Products and Activities (Parentheticals) (Detail) - Collaborative Arrangement [Member] - Sanofi [Member] - USD ($) $ in Millions	3 Months Ended
Dec. 31, 2025	Dec. 31, 2023
Product Information [Line Items]
Payment For Development Milestone	$ 500
Milestone payment received		$ 500

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

Name:	us-gaap_ProductInformationLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration