Basic and Diluted Net Loss per Share - Computation of Basic and Diluted Loss per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Apr. 30, 2024	Apr. 30, 2023
Numerator:
Net loss	$ (71,799)	$ (79,388)
Denominator:
Weighted average common shares outstanding (in shares)	423,290,222	350,073,545
Less: Weighted-average unvested restricted shares and shares subject to repurchase (in shares)	0	(30,091)
Weighted average shares outstanding - basic (in shares)	423,290,222	350,043,454
Weighted average shares outstanding - diluted (in shares)	423,290,222	350,043,454
Net loss per share - basic (in USD per share)	$ (0.17)	$ (0.23)
Net loss per share - diluted (in USD per share)	$ (0.17)	$ (0.23)