Stockholders' Equity - Schedule of Common Stock Reserved for Issuance (Detail) - shares	12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Class Of Stock [Line Items]
Outstanding stock options	68,050,752	73,609,565
Total shares of common stock reserved	166,884,802	144,601,515
2021 Equity Incentive Plan
Class Of Stock [Line Items]
Remaining shares available for future issuance under 2021 Incentive Equity Plan	55,922,182	48,895,572
Employee Stock Purchase Plan
Class Of Stock [Line Items]
Remaining shares available for future issuance under Employee Stock Purchase Plan	16,349,302	11,420,000
Restricted Stock Units [Member]
Class Of Stock [Line Items]
Outstanding restricted stock units	26,562,566	10,676,378