STOCKHOLDERS' EQUITY - Common Stock (Details)	12 Months Ended
	Jan. 31, 2026 vote $ / shares shares	Jan. 31, 2025 $ / shares shares	Jun. 29, 2021 shares
Class of Stock [Line Items]
Common stock, convertibility, percentage of outstanding share holders	66.67%
Common stock, convertibility, number of years from final prospectus	7 years
Common stock, convertibility, percentage of shares outstanding	25.00%
Common stock, convertibility, death or disability period	12 months
Stock options outstanding (in shares)	9,443,196	13,164,743
2021 Plan available for future grants (in shares)	39,736,855	41,803,691
Total shares of common stock reserved (in shares)	96,381,742	94,035,512
RSUs and PSUs
Class of Stock [Line Items]
RSUs and PSUs outstanding and ESPP reserved for future issuance (in shares)	34,438,058	28,016,619
ESPP
Class of Stock [Line Items]
RSUs and PSUs outstanding and ESPP reserved for future issuance (in shares)	12,763,633	11,050,459
Total shares of common stock reserved (in shares)			7,056,319
Class A Common Stock
Class of Stock [Line Items]
Common stock, shares authorized (in shares)	1,500,000,000	1,500,000,000
Common stock, number of voting rights | vote	1
Common stock, par or stated value per share (in USD per share) | $ / shares	$ 0.0001	$ 0.0001
Class B Common Stock
Class of Stock [Line Items]
Common stock, shares authorized (in shares)	300,000,000	300,000,000
Common stock, number of voting rights | vote	20
Common stock, par or stated value per share (in USD per share) | $ / shares	$ 0.0001	$ 0.0001