Equity Incentive Plans and Stock-Based Compensation - Summary of the Stock-Based Compensation (Details) $ in Thousands	12 Months Ended
	Mar. 31, 2024 USD ($) officer	Mar. 31, 2023 USD ($)	Mar. 31, 2022 USD ($)
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation expense	$ 120,209	$ 116,017	$ 57,933
Cost of revenue (1) | Secondary Sale Transaction
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation expense	6,234	10,874	4,029
Research and development | Secondary Sale Transaction
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation expense	37,765	48,837	26,540
Sales and marketing | Secondary Sale Transaction
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation expense	6,567	8,635	5,122
General and administrative | Secondary Sale Transaction
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation expense	68,020	47,671	22,242
General and administrative | Secondary Sale Transaction | Former Lemonaid Officer
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation expense	$ 32,800
Former officers terminated | officer	2
Restructuring and other charges | Secondary Sale Transaction
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation expense	$ 1,623	$ 0	$ 0