Net Loss per Share Attributable to Common Stockholders - Common Stock Equivalents Excluded from Calculation of Diluted Net Loss Per Share (Details) - shares	12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2021
Class A Common Stock [Member]
Earnings Per Share Basic [Line Items]
Outstanding stock options	108,587,430	90,038,538	18,116,302
Class A Common Stock [Member] | ESPP [Member]
Earnings Per Share Basic [Line Items]
Outstanding stock options	2,937,194	2,239,756
Class A Common Stock [Member] | Stock Option Activity [Member]
Earnings Per Share Basic [Line Items]
Outstanding stock options	68,050,752	73,609,565	18,116,302
Class A Common Stock [Member] | Conversion of Redeemable Convertible Preferred Stock [Member]
Earnings Per Share Basic [Line Items]
Outstanding stock options	0
Class A Common Stock [Member] | Restricted Stock Units [Member]
Earnings Per Share Basic [Line Items]
Outstanding stock options	26,562,566	10,676,378
Class A Common Stock [Member] | Shares subject to vesting [Member]
Earnings Per Share Basic [Line Items]
Outstanding stock options	2,576,082	3,512,839
Class A Common Stock [Member] | 2022 AIP RSUs
Earnings Per Share Basic [Line Items]
Outstanding stock options	8,460,836	0	0
Class B Common Stock [Member]
Earnings Per Share Basic [Line Items]
Outstanding stock options			258,442,958
Class B Common Stock [Member] | ESPP [Member]
Earnings Per Share Basic [Line Items]
Outstanding stock options
Class B Common Stock [Member] | Stock Option Activity [Member]
Earnings Per Share Basic [Line Items]
Outstanding stock options			49,261,103
Class B Common Stock [Member] | Conversion of Redeemable Convertible Preferred Stock [Member]
Earnings Per Share Basic [Line Items]
Outstanding stock options			209,181,855
Class B Common Stock [Member] | Restricted Stock Units [Member]
Earnings Per Share Basic [Line Items]
Outstanding stock options
Class B Common Stock [Member] | Shares subject to vesting [Member]
Earnings Per Share Basic [Line Items]
Outstanding stock options
Class B Common Stock [Member] | 2022 AIP RSUs
Earnings Per Share Basic [Line Items]
Outstanding stock options			0