Net Loss Per Share - Computation of Basic and Diluted Net Loss Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended						9 Months Ended
	Oct. 31, 2024	Jul. 31, 2024	Apr. 30, 2024	Oct. 31, 2023	Jul. 31, 2023	Apr. 30, 2023	Oct. 31, 2024	Oct. 31, 2023
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net loss	$ (10,655)	$ (86,097)	$ (28,736)	$ (31,537)	$ (60,361)	$ (31,901)	$ (125,488)	$ (123,799)
Denominator:
Weighted-average shares used in computing net loss per share, basic (in shares)	551,036			567,036			562,950	562,651
Net loss per share, basic (in dollars per share)	$ (0.02)			$ (0.06)			$ (0.22)	$ (0.22)
Numerator:
Net loss	$ (10,655)	$ (86,097)	$ (28,736)	$ (31,537)	$ (60,361)	$ (31,901)	$ (125,488)	$ (123,799)
Denominator:
Weighted-average shares used in computing net loss per share, diluted (in shares)	551,036			567,036			562,950	562,651
Net loss per share, diluted (in dollars per share)	$ (0.02)			$ (0.06)			$ (0.22)	$ (0.22)
Class A
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net loss	$ (9,061)			$ (26,951)			$ (107,108)	$ (105,657)
Denominator:
Weighted-average shares used in computing net loss per share, basic (in shares)	468,583			484,583			480,497	480,198
Net loss per share, basic (in dollars per share)	$ (0.02)			$ (0.06)			$ (0.22)	$ (0.22)
Numerator:
Net loss	$ (9,061)			$ (26,951)			$ (107,108)	$ (105,657)
Denominator:
Weighted-average shares used in computing net loss per share, diluted (in shares)	468,583			484,583			480,497	480,198
Net loss per share, diluted (in dollars per share)	$ (0.02)			$ (0.06)			$ (0.22)	$ (0.22)
Class B
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net loss	$ (1,594)			$ (4,586)			$ (18,380)	$ (18,142)
Denominator:
Weighted-average shares used in computing net loss per share, basic (in shares)	82,453			82,453			82,453	82,453
Net loss per share, basic (in dollars per share)	$ (0.02)			$ (0.06)			$ (0.22)	$ (0.22)
Numerator:
Net loss	$ (1,594)			$ (4,586)			$ (18,380)	$ (18,142)
Denominator:
Weighted-average shares used in computing net loss per share, diluted (in shares)	82,453			82,453			82,453	82,453
Net loss per share, diluted (in dollars per share)	$ (0.02)			$ (0.06)			$ (0.22)	$ (0.22)