Collaborations - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands		12 Months Ended
	Jan. 18, 2022	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2020
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Revenue		$ 271,893	$ 243,920	$ 305,463
Deferred Revenue Current		62,939	71,255
Prepaid expenses and other current assets		25,139	15,485
Cost of Revenue		138,948	126,914	168,031
Increase in revenue adjustment		9,000
Decrease in net loss		9,000
Accounts Payable and Other Accrued Liabilities, Current		44,588	31,953
G S K
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Revenue		46,100	39,900	26,700
Deferred Revenue Current		9,200	30,100
Deferred Revenue, Noncurrent		0	0
Research and development expense		24,000	18,700	19,100
Cost of Revenue		300	1,400	$ 1,000
Aggregate Cash Consideration For Collaboration Arrangement	$ 50,000
Increase in revenue adjustment		9,000
Decrease in net loss		$ (9,000)
Decrease in basic and diluted net loss per share		$ (0.02)
Accounts Payable and Other Accrued Liabilities, Current		$ 18,300	$ 11,500