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, 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
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)
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)
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
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 loss	(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)
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)
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
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 loss	(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
Beginning balance (in shares) at Jan. 31, 2026		295,527,408
Beginning balance at Jan. 31, 2026	$ 9,808,258	$ 295	4,099,753	8,544	5,699,666
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock options (in shares)	347,510	347,510
Issuance of common stock upon exercise of stock options	$ 1,552		1,552
Issuance of common stock upon release of restricted stock units (in shares)		4,995,895
Issuance of common stock upon release of restricted stock units	0	$ 5	(5)
Shares withheld related to net share settlement of equity awards (in shares)		(1,412,143)
Shares withheld related to net share settlement of equity awards	(121,761)	$ (1)	(121,760)
Issuance of common stock for employee stock purchase plan (in shares)		778,701
Issuance of common stock for employee stock purchase plan	40,892	$ 1	40,891
Repurchase of common stock, including excise taxes (in shares)		(7,909,421)
Repurchase of common stock, including excise taxes	(716,561)	$ (8)	(716,553)
Stock-based compensation expense	362,658		362,658
Other comprehensive loss	(39,549)			(39,549)
Net income	1,968,122				1,968,122
Ending balance (in shares) at Jul. 31, 2026		292,327,950
Ending balance at Jul. 31, 2026	11,303,611	$ 292	3,666,536	(31,005)	7,667,788
Beginning balance (in shares) at Apr. 30, 2026		293,487,645
Beginning balance at Apr. 30, 2026	9,971,148	$ 293	3,853,641	(8,129)	6,125,343
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock options (in shares)		98,870
Issuance of common stock upon exercise of stock options	1,048		1,048
Issuance of common stock upon release of restricted stock units (in shares)		2,352,911
Issuance of common stock upon release of restricted stock units	0	$ 2	(2)
Shares withheld related to net share settlement of equity awards (in shares)		(649,964)
Shares withheld related to net share settlement of equity awards	(59,593)		(59,593)
Issuance of common stock for employee stock purchase plan (in shares)		778,701
Issuance of common stock for employee stock purchase plan	40,892	$ 1	40,891
Repurchase of common stock, including excise taxes (in shares)		(3,740,213)
Repurchase of common stock, including excise taxes	(352,998)	$ (4)	(352,994)
Stock-based compensation expense	183,545		183,545
Other comprehensive loss	(22,876)			(22,876)
Net income	1,542,445				1,542,445
Ending balance (in shares) at Jul. 31, 2026		292,327,950
Ending balance at Jul. 31, 2026	$ 11,303,611	$ 292	$ 3,666,536	$ (31,005)	$ 7,667,788