Consolidated Statements of Stockholders’ Equity - USD ($) shares in Thousands, $ in Thousands	Total	Class A Common Stock	Class B Common Stock	Common stock Class A Common Stock	Common stock Class B Common Stock	Treasury stock	Additional paid-in capital	Accumulated other comprehensive income (loss)	Accumulated deficit
Beginning balance (in shares) at Jan. 31, 2023				474,160	82,453
Beginning balance (in shares) at Jan. 31, 2023						0
Beginning balance at Jan. 31, 2023	$ 1,920,158			$ 5	$ 1	$ 0	$ 3,736,838	$ 7,612	$ (1,824,298)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock options (in shares)				5,221
Issuance of common stock upon exercise of stock options	6,728						6,728
Vesting of early exercised stock options	2						2
Issuance of common stock upon settlement of restricted stock units (in shares)				17,695
Tax withholdings on settlement of restricted stock units (in shares)				(6,061)
Tax withholdings on settlement of restricted stock units	(113,162)						(113,162)
Charitable donation of Class A common stock (in shares)				281
Charitable donation of Class A common stock	4,215						4,215
Repurchase of Class A common stock (in shares)						(5,840)
Repurchase of Class A common stock	(102,615)					$ (102,615)
Issuance of common stock under employee stock purchase plan (in shares)				1,364
Issuance of common stock under employee stock purchase plan	17,313						17,313
Stock-based compensation	372,145						372,145
Other comprehensive income (loss), net of tax	1,213							1,213
Net income (loss)	(89,883)								(89,883)
Ending balance (in shares) at Jan. 31, 2024				492,660	82,453
Ending balance (in shares) at Jan. 31, 2024						(5,840)
Ending balance at Jan. 31, 2024	2,016,114			$ 5	$ 1	$ (102,615)	4,024,079	8,825	(1,914,181)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock options (in shares)				4,002
Issuance of common stock upon exercise of stock options	8,032						8,032
Vesting of early exercised stock options	2						2
Issuance of common stock upon settlement of restricted stock units (in shares)				15,357
Tax withholdings on settlement of restricted stock units (in shares)				(5,170)
Tax withholdings on settlement of restricted stock units	(79,299)						(79,299)
Charitable donation of Class A common stock (in shares)				281
Charitable donation of Class A common stock	$ 6,564						6,564
Repurchase of Class A common stock (in shares)	(31,800)					(31,781)
Repurchase of Class A common stock	$ (392,164)					$ (392,164)
Issuance of common stock under employee stock purchase plan (in shares)				1,550
Issuance of common stock under employee stock purchase plan	15,708						15,708
Stock-based compensation	358,214						358,214
Other comprehensive income (loss), net of tax	(13,715)							(13,715)
Net income (loss)	$ (73,694)								(73,694)
Ending balance (in shares) at Jan. 31, 2025		508,680	82,453	508,680	82,453
Ending balance (in shares) at Jan. 31, 2025	(37,621)					(37,621)
Ending balance at Jan. 31, 2025	$ 1,845,762			$ 5	$ 1	$ (494,779)	4,333,300	(4,890)	(1,987,875)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock options (in shares)	3,697			3,697
Issuance of common stock upon exercise of stock options	$ 1,056						1,056
Conversion of Class B common stock into Class A common stock (in shares)				17,762	(17,762)
Issuance of common stock upon settlement of restricted stock units (in shares)				13,575
Tax withholdings on settlement of restricted stock units (in shares)				(4,468)
Tax withholdings on settlement of restricted stock units	(59,081)						(59,081)
Charitable donation of Class A common stock (in shares)				281
Charitable donation of Class A common stock	$ 4,187						4,187
Repurchase of Class A common stock (in shares)	(30,900)					(30,931)
Repurchase of Class A common stock	$ (339,126)					$ (339,126)
Issuance of common stock under employee stock purchase plan (in shares)				1,371
Issuance of common stock under employee stock purchase plan	15,289						15,289
Stock-based compensation	290,679						290,679
Other comprehensive income (loss), net of tax	41,491							41,491
Net income (loss)	$ 282,330								282,330
Ending balance (in shares) at Jan. 31, 2026		540,898	64,691	540,898	64,691
Ending balance (in shares) at Jan. 31, 2026	(68,552)					(68,552)
Ending balance at Jan. 31, 2026	$ 2,082,587			$ 5	$ 1	$ (833,905)	$ 4,585,430	$ 36,601	$ (1,705,545)