Collaboration and License Agreements - Sarepta Therapeutics, Inc. (Details) $ in Thousands						1 Months Ended	12 Months Ended
	Aug. 13, 2025 USD ($) shares	Feb. 24, 2025 USD ($)	Feb. 14, 2025 USD ($)	Feb. 07, 2025 USD ($)	Nov. 25, 2024 USD ($) program obligation	Aug. 31, 2025 USD ($) shares	Sep. 30, 2025 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Value of stock repurchased							$ 53,193
Treasury stock value							53,193	$ 0
Gain on settlement of treasury stock							3,193	0	$ 0
Revenue							829,448	3,551	$ 240,735
Accounts receivable							6,824	$ 0
Sarepta
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Revenue							696,800
Accounts receivable							6,800
Sarepta | Sarepta Collaboration Agreement
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Number of performance obligations | obligation					17
Upfront payment	$ 50,000	$ 500,000	$ 500,000			$ 50,000
Proceeds from sale of stock				$ 325,000
Equity premium				$ 83,600
Total annual installments amount					$ 250,000
Annual installment					$ 50,000
Annual installments period					5 years
Fixed consideration							833,600
Variable consideration							71,200
Total transaction price							$ 904,900
Enrollment related milestone payments					$ 300,000
Number of collaboration programs | program					13
Collaboration agreement termination notice period prior to any regulatory approval of a licensed product					30 days
Common stock repurchased (in shares) | shares	2,660,989					2,660,989
Development milestone payments						$ 100,000
Value of stock repurchased	$ 50,000					50,000
Treasury stock value	53,200					53,200
Gain on settlement of treasury stock	$ 3,200					$ 3,200
Sarepta | Sarepta Collaboration Agreement | Maximum
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Number of new target programs | program					6
Regulatory milestone payments					$ 180,000
Sales-related milestone payments					700,000
Sarepta | Sarepta Collaboration Agreement | Minimum
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Regulatory milestone payments					110,000
Sales-related milestone payments					$ 500,000