Equity Plans and Stock-based Compensation - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands			1 Months Ended	3 Months Ended	12 Months Ended
	Jun. 01, 2022	Feb. 25, 2021	Jun. 30, 2020	Jan. 31, 2023	Jan. 31, 2023	Jan. 31, 2022	Jan. 31, 2021
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Unrecognized stock-based compensation cost not yet recognized				$ 191,600	$ 191,600
Period for recognition (in years)					2 years 9 months 18 days
Number of stock options granted (in shares)					0
2021 Equity Incentive Plan
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Possible increase in percent of outstanding shares (as a percent)		1.00%
Number of additional shares allowable under the plan (in shares)		5,400,000
Percent of outstanding shares (as a percent)		5.00%
2021 Stock Option Plan
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Total shares of common stock reserved (in shares)				39,406,473	39,406,473
Number of stock options granted (in shares)					0
2017 Stock Plan
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Total shares of common stock reserved (in shares)						15,746,369
2017 Stock Plan | Chief Executive Officer
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Number of stock options granted (in shares)			1,500,000
Share-Based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount				$ 14,100	$ 14,100	$ 28,400
2007 Stock Plan
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Total shares of common stock reserved (in shares)						1,854,155
Employee stock purchase plan
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Eligible compensation per employee (as a percent)				15.00%	15.00%
Offering period (in months)					24 months
Purchase period (in months)					6 months
Purchase price of common stock, percent of fair value					85.00%
Maximum number of shares to be purchased per employee (in shares)					10,000
Total shares of common stock reserved (in shares)				10,919,906	10,919,906
Share-Based Compensation Arrangement by Share-Based Payment Award, Shares Purchased for Award				607,384
Price per share (USD per share)				$ 14.73	$ 14.73
Proceeds from shares purchased					$ 8,900
Restricted stock units
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Granted (in dollars per share)					$ 12.72
Fair value of awards vested					$ 58,400
Options to purchase common stock | 2017 Stock Plan
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Weighted average grant date fair value (USD per share)							$ 0.94
Grant date fair value					$ 2,000	$ 3,400	$ 5,400
Options to purchase common stock | 2017 Stock Plan | Chief Executive Officer
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Period for recognition (in years)					1 year
Performance Restricted Stock Units | Share-based Payment Arrangement, Tranche One
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Share-Based Compensation Arrangement By Share-Based Payment Award, Award Vesting Rights, Consecutive Trading Days	20 days
Share-Based Compensation Arrangement By Share-Based Payment Award, Target Price Per Common Share	$ 17
Vesting percentage (as a percent)	25.00%
Performance Restricted Stock Units | Share-Based Payment Arrangement, Tranche Two
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Share-Based Compensation Arrangement By Share-Based Payment Award, Target Price Per Common Share	$ 22
Vesting percentage (as a percent)	35.00%
Performance Restricted Stock Units | Share-Based Payment Arrangement, Tranche Three
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Share-Based Compensation Arrangement By Share-Based Payment Award, Target Price Per Common Share	$ 30
Vesting percentage (as a percent)	40.00%