Collaborations - Additional Information (Detail) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended		12 Months Ended
	Oct. 31, 2022	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Mar. 31, 2023
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Revenue		$ 49,999	$ 75,659	$ 110,863	$ 140,172
Deferred Revenue Current		40,283		40,283		$ 62,521
Cost of Revenue		(28,270)	(37,386)	(58,453)	(76,409)
Accounts Payable and Other Accrued Liabilities, Current		44,686		44,686		66,430
G S K
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Revenue		1,100	14,900	11,800	23,200
Aggregate Cash Consideration For Collaboration Arrangement	$ 50,000
Deferred Revenue Current						11,800
Research and development expense		4,900	$ 2,700	8,200	$ 6,300
Accounts Payable and Other Accrued Liabilities, Current		$ 13,700		$ 13,700		$ 11,900
Voting interest percentage				20.00%		20.10%