CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Income (Loss)	Retained Earnings
Beginning balance (in shares) at Jan. 31, 2021		293,549,223
Beginning balance at Jan. 31, 2021	$ 3,860,767	$ 292	$ 3,187,168	$ 839	$ 672,468
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock options (in shares)		2,881,485
Issuance of common stock upon exercise of stock options	14,810	$ 4	14,806
Issuance of common stock upon release of restricted stock units (in shares)		1,768,702
Issuance of common stock upon release of restricted stock units	2	$ 2
Issuance of common stock for employee stock purchase plan (in shares)		838,395
Issuance of common stock for employee stock purchase plan	59,331	$ 1	59,330
Stock-based compensation expense	488,210		488,210
Other comprehensive loss	(18,741)			(18,741)
Net income	1,375,639				1,375,639
Ending balance (in shares) at Jan. 31, 2022		299,037,805
Ending balance at Jan. 31, 2022	5,780,018	$ 299	3,749,514	(17,902)	2,048,107
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock options (in shares)		1,299,758
Issuance of common stock upon exercise of stock options	8,815	$ 1	8,814
Issuance of common stock upon release of restricted stock units (in shares)		3,977,915
Issuance of common stock upon release of restricted stock units	0	$ 4	(4)
Repurchase of common stock (in shares)		(11,170,907)
Repurchase of common stock	(1,000,003)	$ (11)	(999,992)
Issuance of common stock for employee stock purchase plan (in shares)		678,279
Issuance of common stock for employee stock purchase plan	53,710	$ 1	53,709
Stock-based compensation expense	1,292,839		1,292,839
Other comprehensive loss	(32,483)			(32,483)
Net income	103,711				103,711
Ending balance (in shares) at Jan. 31, 2023		293,822,850
Ending 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	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 loss	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