Collaborations - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Mar. 31, 2021
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Revenue	$ 56,891	$ 55,477	$ 171,334	$ 155,338
Deferred Revenue Current	111,961		111,961		$ 71,255
Prepaid expenses and other current assets	25,253		25,253		15,485
Cost of Revenue	29,628	30,089	85,446	82,861
Accounts Payable and Other Accrued Liabilities, Current	46,297		46,297		31,953
G S K
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Revenue	8,100	8,600	29,300	30,200
Deferred Revenue Current	26,200		26,200		30,100
Deferred Revenue, Noncurrent	0		0		0
Receivables, Net, Current	100		100		0
Prepaid expenses and other current assets	200		200		0
Research and development expense	6,300	4,200	18,200	10,700
Cost of Revenue	100	$ 100	200	$ 600
Accounts Payable and Other Accrued Liabilities, Current	$ 12,500		$ 12,500		$ 11,500