Revenue - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2024	Dec. 31, 2023	Mar. 31, 2024
Disaggregation of Revenue [Line Items]
Revenue recognized from unreturned kits	$ 4.4	$ 4.4	$ 13.8	$ 13.4
Contract assets	$ 0.0		$ 0.0		$ 0.0
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01
Disaggregation of Revenue [Line Items]
Revenue to be recognized, percentage	51.00%		51.00%
Remaining performance obligation, expected timing of satisfaction, period	12 months		12 months
Consumer services
Disaggregation of Revenue [Line Items]
Deferred revenue for customer services	$ 59.8		$ 59.8		52.3
Revenue recognized	6.5		38.9
Research services
Disaggregation of Revenue [Line Items]
Deferred revenue for customer services	3.1		3.1		22.5
Revenue recognized	19.8		21.2
Remaining performance obligations	7.2		7.2
Research services | Related Party
Disaggregation of Revenue [Line Items]
Deferred revenue for customer services	2.0		2.0		$ 21.0
Revenue recognized	$ 19.7		$ 20.2