NET LOSS PER SHARE ATTRIBUTABLE TO COMMON STOCKHOLDERS - Basic and Diluted (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Jan. 31, 2026	Jan. 31, 2025	Jan. 31, 2024
Numerator:
Net loss attributable to Class A and Class B common stockholders	$ (450,735)	$ (288,441)	$ (338,693)
Denominator:
Weighted-average shares used in computing net loss per share attributable to Class A and Class B common stockholders, basic (in shares)	330,111,148	314,811,783	294,923,536
Weighted-average shares used in computing net loss per share attributable to Class A and Class B common stockholders, diluted (in shares)	330,111,148	314,811,783	294,923,536
Net loss per share attributable to Class A and Class B common stockholders, basic (in USD per share)	$ (1.37)	$ (0.92)	$ (1.15)
Net loss per share attributable to Class A and Class B common stockholders, diluted (in USD per share)	$ (1.37)	$ (0.92)	$ (1.15)