Net Loss Per Share - Schedule of Earnings Per Share, Basic and Diluted (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2024	Oct. 31, 2023	Oct. 31, 2024	Oct. 31, 2023
Numerator:
Net loss	$ (130,910)	$ (86,267)	$ (1,039,931)	$ (256,661)
Denominator:
Weighted-average common stock shares used in computing net loss per share, basic (in shares)	183,590	61,023	142,985	60,425
Weighted-average common stock shares used in computing net loss per share, diluted (in shares)	183,590	61,023	142,985	60,425
Net loss per common stock share, basic (in dollars per share)	$ (0.71)	$ (1.41)	$ (7.27)	$ (4.25)
Net loss per common stock share, diluted (in dollars per share)	$ (0.71)	$ (1.41)	$ (7.27)	$ (4.25)
Class A common stock
Numerator:
Net loss	$ (53,934)		$ (327,198)
Denominator:
Weighted-average common stock shares used in computing net loss per share, basic (in shares)	75,638		44,988
Weighted-average common stock shares used in computing net loss per share, diluted (in shares)	75,638		44,988
Net loss per common stock share, basic (in dollars per share)	$ (0.71)		$ (7.27)
Net loss per common stock share, diluted (in dollars per share)	$ (0.71)		$ (7.27)
Class B common stock
Numerator:
Net loss	$ (76,976)	$ (86,267)	$ (712,733)	$ (256,661)
Denominator:
Weighted-average common stock shares used in computing net loss per share, basic (in shares)	107,952	55,623	97,997	55,025
Weighted-average common stock shares used in computing net loss per share, diluted (in shares)	107,952	55,623	97,997	55,025
Net loss per common stock share, basic (in dollars per share)	$ (0.71)	$ (1.41)	$ (7.27)	$ (4.25)
Net loss per common stock share, diluted (in dollars per share)	$ (0.71)	$ (1.41)	$ (7.27)	$ (4.25)
Common Stock B, Founders Stock
Denominator:
Weighted-average common stock shares used in computing net loss per share, basic (in shares)		5,400		5,400
Weighted-average common stock shares used in computing net loss per share, diluted (in shares)		5,400		5,400
Net loss per common stock share, basic (in dollars per share)		$ (1.41)		$ (4.25)
Net loss per common stock share, diluted (in dollars per share)		$ (1.41)		$ (4.25)