Equity Plans and Stock-based Compensation - Narrative (Details)					1 Months Ended	3 Months Ended		9 Months Ended
	Sep. 01, 2022	Jun. 01, 2022 $ / shares	Mar. 01, 2021	Feb. 25, 2021 shares	Jun. 30, 2021 USD ($) shares	Oct. 31, 2022 USD ($) shares	Oct. 31, 2021 USD ($)	Oct. 31, 2022 USD ($) contribution shares	Oct. 31, 2021 USD ($)	Jan. 31, 2022 shares
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Common stock reserved (in shares)						140,393,840		140,393,840		106,331,590
Total stock-based compensation expense | $						$ 25,698,000	$ 16,022,000	$ 67,644,000	$ 51,893,000
2021 Equity Incentive Plan
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Percent of outstanding shares (as a percent)				5.00%
2017 Stock Plan
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Common stock reserved (in shares)						16,564,913		16,564,913
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
Total stock-based compensation expense | $					$ 0
Stock Options | $						$ 17,600,000		$ 17,600,000
2007 Stock Plan
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Common stock reserved (in shares)						2,220,803		2,220,803
2021 Stock Option Plan
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Common stock reserved (in shares)						40,060,867		40,060,867		36,370,596
Number of stock options granted (in shares)						0		0
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
Maximum number of contribution increases | contribution								1
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
Common stock reserved (in shares)						10,919,906		10,919,906		8,177,683
Number of shares purchased (in shares)						343,422		607,384
Total stock-based compensation expense | $						$ 1,783,000	321,000	$ 5,217,000	321,000
Period for recognition (in years)								1 year 10 months 9 days
PRSUs
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Dividend rate	0.00%	0.00%
Total stock-based compensation expense | $						$ 2,696,000	0	$ 4,649,000	0
Period for recognition (in years)								2 years 8 months 1 day
PRSUs | Tranche One
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Consecutive trading days (in days)		20 days
Target price (in USD per share) | $ / shares		$ 17
Vesting percentage		25.00%
PRSUs | Tranche Two
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Target price (in USD per share) | $ / shares		$ 22
Vesting percentage		35.00%
PRSUs | Tranche Three
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Target price (in USD per share) | $ / shares		$ 30
Vesting percentage		40.00%
PRSUs | Chief Executive Officer
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Service conditions vesting percentage		8.30%
PRSUs | Officer, excluding Chief Executive Officer
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Service conditions vesting percentage		5.00%
Options to purchase common stock
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Common stock reserved (in shares)						18,785,716		18,785,716		22,200,869
Total stock-based compensation expense | $						$ 4,145,000	$ 4,411,000	$ 12,491,000	$ 16,429,000
Stock Options | $						$ 19,882,000		$ 19,882,000
Period for recognition (in years)								1 year 1 month 17 days
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 3 months