CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Class A and Class B Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Income	Accumulated Deficit	Class A and Class B Common Stock Class A and Class B Common Stock
Beginning balance (in shares) at Jan. 31, 2025						325,579,105
Beginning balance at Jan. 31, 2025	$ 1,669,247		$ 3,294,542	$ 2,158	$ (1,627,485)	$ 32
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock options (in shares)						2,520,990
Issuance of common stock upon exercise of stock options	12,277		12,277
Vesting of restricted stock units and performance stock units (in shares)						2,972,074
Vesting of restricted stock units and performance stock units	1	$ 1
Stock-based compensation	71,315		71,315
Other comprehensive income (loss)	1,895
Net loss	(208,193)				(208,193)
Ending balance (in shares) at Apr. 30, 2025						331,072,169
Ending balance at Apr. 30, 2025	1,546,542		3,378,134	4,053	(1,835,678)	$ 33
Beginning balance (in shares) at Jan. 31, 2026						337,776,950
Beginning balance at Jan. 31, 2026	1,437,145		3,513,017	2,314	(2,078,220)	$ 34
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock options (in shares)						216,140
Issuance of common stock upon exercise of stock options	882		882
Vesting of restricted stock units and performance stock units (in shares)						3,490,265
Vesting of restricted stock units and performance stock units	1					$ 1
Cancellation of common stock in connection with acquisition (in shares)						(1,952)
Cancellation of common stock in connection with acquisition	(37)		(37)
Stock-based compensation	77,557		77,557
Other comprehensive income (loss)	(1,263)			(1,263)
Net loss	(76,164)				(76,164)
Ending balance (in shares) at Apr. 30, 2026						341,481,403
Ending balance at Apr. 30, 2026	$ 1,438,121		$ 3,591,419	$ 1,051	$ (2,154,384)	$ 35