CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive (Loss) Income	Retained Earnings
Beginning balance (in shares) at Jan. 31, 2023		293,822,850
Beginning balance at Jan. 31, 2023	$ 6,206,607	$ 294	$ 4,104,880	$ (50,385)	$ 2,151,818
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock options (in shares)		1,464,158
Issuance of common stock upon exercise of stock options	10,195	$ 1	10,194
Issuance of common stock upon release of restricted stock units (in shares)		11,349,453
Issuance of common stock upon release of restricted stock units	0	$ 11	(11)
Issuance of common stock for employee stock purchase plan (in shares)		921,892
Issuance of common stock for employee stock purchase plan	54,097	$ 1	54,096
Stock-based compensation expense	1,059,597		1,059,597
Other comprehensive income	51,448			51,448
Net income	637,462				637,462
Ending balance (in shares) at Jan. 31, 2024		307,558,353
Ending balance at Jan. 31, 2024	8,019,406	$ 307	5,228,756	1,063	2,789,280
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock options (in shares)		908,844
Issuance of common stock upon exercise of stock options	4,619	$ 1	4,618
Issuance of common stock upon release of restricted stock units (in shares)		12,095,006
Issuance of common stock upon release of restricted stock units	0	$ 12	(12)
Repurchase of common stock (in shares)		(15,888,316)
Repurchase of common stock	(1,095,118)	$ (16)	(1,095,102)
Issuance of common stock for employee stock purchase plan (in shares)		1,066,977
Issuance of common stock for employee stock purchase plan	54,008	$ 1	54,007
Stock-based compensation expense	938,004		938,004
Other comprehensive income	3,927			3,927
Net income	1,010,238				1,010,238
Ending balance (in shares) at Jan. 31, 2025		305,740,864
Ending balance at Jan. 31, 2025	$ 8,935,084	$ 305	5,130,271	4,990	3,799,518
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock options (in shares)	842,567	842,567
Issuance of common stock upon exercise of stock options	$ 2,482	$ 1	2,481
Issuance of common stock upon release of restricted stock units (in shares)		11,309,015
Issuance of common stock upon release of restricted stock units	0	$ 11	(11)
Shares withheld related to net share settlement of equity awards (in shares)		(3,180,420)
Shares withheld related to net share settlement of equity awards	(247,832)	$ (3)	(247,829)
Repurchase of common stock (in shares)		(20,385,361)
Repurchase of common stock	(1,628,098)	$ (20)	(1,628,078)
Issuance of common stock for employee stock purchase plan (in shares)		1,200,743
Issuance of common stock for employee stock purchase plan	61,206	$ 1	61,205
Charitable donation of common stock	20,904		20,904
Stock-based compensation expense	760,810		760,810
Other comprehensive income	3,554			3,554
Net income	1,900,148				1,900,148
Ending balance (in shares) at Jan. 31, 2026		295,527,408
Ending balance at Jan. 31, 2026	$ 9,808,258	$ 295	$ 4,099,753	$ 8,544	$ 5,699,666