Common Stock and Stockholders' Equity (Deficit) - Additional Information (Details) - USD ($)	3 Months Ended			6 Months Ended
	Jul. 31, 2022	Apr. 30, 2022	Apr. 30, 2021	Jul. 31, 2022	Jul. 31, 2021	Jan. 31, 2022
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock capital shares reserved for future issuance	49,024,402			49,024,402		42,248,307
Stock-based compensation expense		$ 42,403,000	$ 1,498,000	$ 88,662,000	$ 3,224,000
Unrecognized stock-based compensation expense	$ 2,900,000			$ 2,900,000
Unrecognized stock-based compensation expense, weighted-average period				1 year 4 months 24 days
Exercisable shares vested	9,750,090			9,750,090
Unvested early exercise provision	750			750
Total grant-date fair value of stock options vested				$ 2,800,000	3,400,000
Total intrinsic value of options exercised				59,500,000	35,200,000
Cash proceeds from common stock				8,501,000
Accrued compensation and benefits	$ 54,978,000			$ 54,978,000		$ 56,939,000
2021 Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Options granted	0			0
Total intrinsic value of options exercised				$ 59,482,000
Number of shares available for sale	23,084,726			23,084,726		17,560,879
2021 Employee Stock Purchase Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock capital shares reserved for future issuance	3,370,329			3,370,329		1,900,000
Stock-based compensation expense				$ 7,300,000
Unrecognized stock-based compensation expense	$ 22,600,000			$ 22,600,000
Unrecognized stock-based compensation expense, weighted-average period				1 year 10 months 24 days
Employee stock purchase plan, share issued				351,284
Purchase price per share	$ 24.20			$ 24.20
Cash proceeds from common stock				$ 8,500,000
Accrued compensation and benefits	$ 4,100,000			$ 4,100,000	0
Rollover offering period				2 years
Rollover closing stock price period				Jun. 15, 2022
Closing stock price period				Dec. 08, 2021
Offering period				24 months
Offering period date				Jun. 15, 2024
Incremental compensation cost recognized due to modification				$ 4,900,000
Restricted Stock Units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock capital shares reserved for future issuance	11,985,438			11,985,438		10,406,294
Unrecognized stock-based compensation expense	$ 390,600,000			$ 390,600,000
Unrecognized stock-based compensation expense, weighted-average period				2 years 4 months 24 days
Grant-date fair value of vested shares				$ 64,900,000	$ 0
Common Class A | 2021 Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock capital shares reserved for future issuance	23,084,726			23,084,726
Common Class A | 2021 Employee Stock Purchase Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares available for sale	3,370,329			3,370,329