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		6 Months Ended
	Jul. 31, 2024	Jul. 31, 2023	Jul. 31, 2024	Jul. 31, 2023
Numerator:
Net loss	$ (176,930)	$ (81,121)	$ (909,021)	$ (170,394)
Denominator:
Weighted-average common stock shares used in computing net loss per share, basic (in shares)	179,851	60,296	122,460	60,121
Weighted-average common stock shares used in computing net loss per share, diluted (in shares)	179,851	60,296	122,460	60,121
Net loss per common stock share, basic (in dollars per share)	$ (0.98)	$ (1.35)	$ (7.42)	$ (2.83)
Net loss per common stock share, diluted (in dollars per share)	$ (0.98)	$ (1.35)	$ (7.42)	$ (2.83)
Class A common stock
Numerator:
Net loss	$ (55,630)		$ (218,941)
Denominator:
Weighted-average common stock shares used in computing net loss per share, basic (in shares)	56,548		29,495
Weighted-average common stock shares used in computing net loss per share, diluted (in shares)	56,548		29,495
Net loss per common stock share, basic (in dollars per share)	$ (0.98)		$ (7.42)
Net loss per common stock share, diluted (in dollars per share)	$ (0.98)		$ (7.42)
Class B common stock
Numerator:
Net loss	$ (121,300)	$ (81,121)	$ (690,080)	$ (170,394)
Denominator:
Weighted-average common stock shares used in computing net loss per share, basic (in shares)	123,303	54,896	92,965	54,721
Weighted-average common stock shares used in computing net loss per share, diluted (in shares)	123,303	54,896	92,965	54,721
Net loss per common stock share, basic (in dollars per share)	$ (0.98)	$ (1.35)	$ (7.42)	$ (2.83)
Net loss per common stock share, diluted (in dollars per share)	$ (0.98)	$ (1.35)	$ (7.42)	$ (2.83)
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)		$ (1.35)		$ (2.83)
Net loss per common stock share, diluted (in dollars per share)		$ (1.35)		$ (2.83)