Basic and Diluted Net Loss per Share - Computation of Basic and Diluted Loss per Share (Details)	12 Months Ended
	Jan. 31, 2024 USD ($) $ / shares shares	Jan. 31, 2023 USD ($) $ / shares shares	Jan. 31, 2022 USD ($) $ / shares shares
Numerator:
Net income (loss)	$ (457,609,000)	$ (345,108,000)	$ (132,241,000)
Cumulative undeclared dividends on redeemable convertible preferred stock	0	0	(4,292,000)
Deemed dividends attributable to vested option holders	0	0	(51,855,000)
Deemed dividends attributable to common stock warrant holders	0	0	(110,635,000)
Net loss attributable to common stockholders - Basic	(457,609,000)	(345,108,000)	(299,023,000)
Gain attributable to earnout shares issued	0	0	(84,420,000)
Change in fair value of dilutive warrants	0	0	(68,223,000)
Net loss attributable to common stockholders - Diluted	$ (457,609,000)	$ (345,108,000)	$ (451,666,000)
Denominator:
Weighted average common shares outstanding (in shares) | shares	375,543,916	338,576,326	297,642,999
Less: Weighted-average unvested restricted shares and shares subject to repurchase (in shares) | shares	(14,033)	(87,659)	(221,030)
Weighted average shares outstanding - Basic (in shares) | shares	375,529,883	338,488,667	297,421,969
Add: Earnout Shares under the treasury stock method (in shares) | shares	0	0	3,701,427
Add: Public and Private Placement Warrants under the treasury stock method (in shares) | shares	0	0	1,366,870
Weighted average shares outstanding - Diluted (in shares) | shares	375,529,883	338,488,667	302,490,266
Net loss per share - Basic (USD per share) | $ / shares	$ (1.22)	$ (1.02)	$ (1.01)
Net loss per share - Diluted (USD per share) | $ / shares	$ (1.22)	$ (1.02)	$ (1.49)
Recapitalization exchange ratio		0.9966