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, 2025	Jul. 31, 2024	Jul. 31, 2025	Jul. 31, 2024
Numerator:
Net loss	$ (95,929)	$ (176,930)	$ (198,033)	$ (909,021)
Denominator:
Weighted-average common stock shares used in computing net loss per share, basic (in shares)	194,890	179,851	193,284	122,460
Weighted-average common stock shares used in computing net loss per share, diluted (in shares)	194,890	179,851	193,284	122,460
Net loss per common stock share, basic (in dollars per share)	$ (0.49)	$ (0.98)	$ (1.02)	$ (7.42)
Net loss per common stock share, diluted (in dollars per share)	$ (0.49)	$ (0.98)	$ (1.02)	$ (7.42)
Class A
Numerator:
Net loss	$ (64,474)	$ (55,630)	$ (124,810)	$ (218,941)
Denominator:
Weighted-average common stock shares used in computing net loss per share, basic (in shares)	130,985	56,548	121,817	29,495
Weighted-average common stock shares used in computing net loss per share, diluted (in shares)	130,985	56,548	121,817	29,495
Net loss per common stock share, basic (in dollars per share)	$ (0.49)	$ (0.98)	$ (1.02)	$ (7.42)
Net loss per common stock share, diluted (in dollars per share)	$ (0.49)	$ (0.98)	$ (1.02)	$ (7.42)
Class B
Numerator:
Net loss	$ (31,455)	$ (121,300)	$ (73,223)	$ (690,080)
Denominator:
Weighted-average common stock shares used in computing net loss per share, basic (in shares)	63,905	123,303	71,467	92,965
Weighted-average common stock shares used in computing net loss per share, diluted (in shares)	63,905	123,303	71,467	92,965
Net loss per common stock share, basic (in dollars per share)	$ (0.49)	$ (0.98)	$ (1.02)	$ (7.42)
Net loss per common stock share, diluted (in dollars per share)	$ (0.49)	$ (0.98)	$ (1.02)	$ (7.42)