CONDENSED 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, 2024		307,558,353
Beginning 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)		221,827
Issuance of common stock upon exercise of stock options	1,855		1,855
Issuance of common stock upon release of restricted stock units (in shares)		6,778,788
Issuance of common stock upon release of restricted stock units	0	$ 7	(7)
Issuance of common stock for employee stock purchase plan (in shares)		666,051
Issuance of common stock for employee stock purchase plan	34,263	$ 1	34,262
Repurchase of common stock, including excise taxes (in shares)		(7,229,395)
Repurchase of common stock, including excise taxes	(437,693)	$ (7)	(437,686)
Stock-based compensation expense	470,965		470,965
Other comprehensive income	1,128			1,128
Net income	435,323				435,323
Ending balance (in shares) at Jul. 31, 2024		307,995,624
Ending balance at Jul. 31, 2024	8,525,247	$ 308	5,298,145	2,191	3,224,603
Beginning balance (in shares) at Apr. 30, 2024		309,268,684
Beginning balance at Apr. 30, 2024	8,298,824	$ 309	5,310,417	(17,490)	3,005,588
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock options (in shares)		112,363
Issuance of common stock upon exercise of stock options	839		839
Issuance of common stock upon release of restricted stock units (in shares)		2,777,616
Issuance of common stock upon release of restricted stock units	0	$ 3	(3)
Issuance of common stock for employee stock purchase plan (in shares)		666,051
Issuance of common stock for employee stock purchase plan	34,263	$ 1	34,262
Repurchase of common stock, including excise taxes (in shares)		(4,829,090)
Repurchase of common stock, including excise taxes	(287,645)	$ (5)	(287,640)
Stock-based compensation expense	240,270		240,270
Other comprehensive income	19,681			19,681
Net income	219,015				219,015
Ending balance (in shares) at Jul. 31, 2024		307,995,624
Ending balance at Jul. 31, 2024	8,525,247	$ 308	5,298,145	2,191	3,224,603
Beginning balance (in shares) at Jan. 31, 2025		305,740,864
Beginning 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)	471,770	471,770
Issuance of common stock upon exercise of stock options	$ 1,375		1,375
Issuance of common stock upon release of restricted stock units (in shares)		6,578,596
Issuance of common stock upon release of restricted stock units	0	$ 7	(7)
Issuance of common stock for employee stock purchase plan (in shares)		714,513
Issuance of common stock for employee stock purchase plan	36,058	$ 1	36,057
Shares withheld related to net share settlement of equity awards (in shares)		(1,872,841)
Shares withheld related to net share settlement of equity awards	(137,457)	$ (2)	(137,455)
Repurchase of common stock, including excise taxes (in shares)		(11,512,818)
Repurchase of common stock, including excise taxes	(885,803)	$ (12)	(885,791)
Stock-based compensation expense	393,092		393,092
Other comprehensive income	(5,467)			(5,467)
Net income	613,195				613,195
Ending balance (in shares) at Jul. 31, 2025		300,120,084
Ending balance at Jul. 31, 2025	8,950,077	$ 299	4,537,542	(477)	4,412,713
Beginning balance (in shares) at Apr. 30, 2025		303,379,326
Beginning balance at Apr. 30, 2025	8,902,368	$ 302	4,832,800	15,145	4,054,121
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock options (in shares)		116,150
Issuance of common stock upon exercise of stock options	421		421
Issuance of common stock upon release of restricted stock units (in shares)		2,561,963
Issuance of common stock upon release of restricted stock units	0	$ 3	(3)
Issuance of common stock for employee stock purchase plan (in shares)		714,513
Issuance of common stock for employee stock purchase plan	36,058	$ 1	36,057
Shares withheld related to net share settlement of equity awards (in shares)		(700,970)
Shares withheld related to net share settlement of equity awards	(55,304)	$ (1)	(55,303)
Repurchase of common stock, including excise taxes (in shares)		(5,950,898)
Repurchase of common stock, including excise taxes	(465,897)	$ (6)	(465,891)
Stock-based compensation expense	189,461		189,461
Other comprehensive income	(15,622)			(15,622)
Net income	358,592				358,592
Ending balance (in shares) at Jul. 31, 2025		300,120,084
Ending balance at Jul. 31, 2025	$ 8,950,077	$ 299	$ 4,537,542	$ (477)	$ 4,412,713