Related Party Transactions (Details) - USD ($) $ / shares in Units, $ in Thousands		1 Months Ended		3 Months Ended	12 Months Ended
	Feb. 04, 2021	Jan. 31, 2024	Jul. 31, 2018	Mar. 31, 2024	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2022
Related Party Transaction [Line Items]
Revenue					$ 219,638	$ 299,489	$ 271,893
Related Party
Related Party Transaction [Line Items]
Revenue					$ 12,004	$ 47,448	$ 46,064
Common Stock Class A
Related Party Transaction [Line Items]
Subscription shares issued (in shares)	25,000,000
Common Stock Class A | PIPE Investment
Related Party Transaction [Line Items]
Gross proceeds	$ 250,000
Common Stock Class A | The Anne Wojcicki Foundation | Related Party
Related Party Transaction [Line Items]
Subscription shares issued (in shares)	2,500,000
Common Stock Class A | VG Acquisition Sponsor LLC
Related Party Transaction [Line Items]
Common stock, price per share (in usd per share)	$ 10.00
GSK Collaboration Agreement | Related Party
Related Party Transaction [Line Items]
Voting interest percentage					19.90%	20.10%
GSK Collaboration Agreement | Series F1 Redeemable Convertible Preferred Stock | Related Party
Related Party Transaction [Line Items]
Redeemable convertible preferred stock purchase (in shares)			17,291,066
TWF Agreement | Related Party
Related Party Transaction [Line Items]
Revenue				$ 300
TWF Agreement | Troper Wojcicki Foundation | Related Party
Related Party Transaction [Line Items]
Research service agreement, period		5 years
Fees under initial SOW		$ 5,400		$ 1,000	$ 1,000