Condensed Consolidated Statements of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands		Total	Class A	Class B	Common Stock Class A	Common Stock Class B	Treasury Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Income (Loss)	Accumulated Deficit
Beginning balance (in shares) at Jan. 31, 2024					492,660	82,453
Beginning Balance (in shares) at Jan. 31, 2024							(5,840)
Beginning 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)					1,426
Issuance of common stock upon exercise of stock options		311						311
Issuance of common stock upon settlement of restricted stock units (in shares)					3,843
Tax withholdings on settlement of restricted stock units (in shares)					(1,317)
Tax withholdings on settlement of restricted stock units		(29,944)						(29,944)
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)							(938)
Repurchase of Class A common stock		(22,005)					$ (22,005)
Stock-based compensation		88,785						88,785
Other comprehensive income (loss), net		(4,085)							(4,085)
Net income (loss)		(28,736)								(28,736)
Ending balance (in shares) at Apr. 30, 2024					496,893	82,453
Ending Balance (in shares) at Apr. 30, 2024							(6,778)
Ending balance at Apr. 30, 2024		2,027,004			$ 5	$ 1	$ (124,620)	4,089,795	4,740	(1,942,917)
Beginning balance (in shares) at Jan. 31, 2024					492,660	82,453
Beginning Balance (in shares) at Jan. 31, 2024							(5,840)
Beginning 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]
Charitable donation of Class A common stock (in shares)					300
Repurchase of Class A common stock (in shares)		(31,000)
Other comprehensive income (loss), net		$ 99
Net income (loss)		(125,488)	$ (107,108)	$ (18,380)
Ending balance (in shares) at Oct. 31, 2024					504,084	82,453
Ending Balance (in shares) at Oct. 31, 2024							(36,877)
Ending balance at Oct. 31, 2024		1,731,845			$ 5	$ 1	$ (486,985)	4,249,569	8,924	(2,039,669)
Beginning balance (in shares) at Apr. 30, 2024					496,893	82,453
Beginning Balance (in shares) at Apr. 30, 2024							(6,778)
Beginning balance at Apr. 30, 2024		2,027,004			$ 5	$ 1	$ (124,620)	4,089,795	4,740	(1,942,917)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock options (in shares)					727
Issuance of common stock upon exercise of stock options		331						331
Issuance of common stock upon settlement of restricted stock units (in shares)					3,970
Vesting of early exercise stock options		1						1
Tax withholdings on settlement of restricted stock units (in shares)					(1,293)
Tax withholdings on settlement of restricted stock units		(16,727)						(16,727)
Repurchase of Class A common stock (in shares)							(16,326)
Repurchase of Class A common stock		(197,427)					$ (197,427)
Issuance of common stock under employee stock purchase plan (in shares)					865
Issuance of common stock under employee stock purchase plan		8,824						8,824
Stock-based compensation		94,307						94,307
Other comprehensive income (loss), net		3,365							3,365
Net income (loss)		(86,097)								(86,097)
Ending balance (in shares) at Jul. 31, 2024					501,162	82,453
Ending Balance (in shares) at Jul. 31, 2024							(23,104)
Ending balance at Jul. 31, 2024		1,833,581			$ 5	$ 1	$ (322,047)	4,176,531	8,105	(2,029,014)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock options (in shares)					520
Issuance of common stock upon exercise of stock options		291						291
Issuance of common stock upon settlement of restricted stock units (in shares)					3,555
Vesting of early exercise stock options		1						1
Tax withholdings on settlement of restricted stock units (in shares)					(1,153)
Tax withholdings on settlement of restricted stock units		(14,744)						(14,744)
Repurchase of Class A common stock (in shares)							(13,773)
Repurchase of Class A common stock		(164,938)					$ (164,938)
Stock-based compensation		87,490						87,490
Other comprehensive income (loss), net		819							819
Net income (loss)		(10,655)	$ (9,061)	$ (1,594)						(10,655)
Ending balance (in shares) at Oct. 31, 2024					504,084	82,453
Ending Balance (in shares) at Oct. 31, 2024							(36,877)
Ending balance at Oct. 31, 2024		$ 1,731,845			$ 5	$ 1	$ (486,985)	4,249,569	8,924	(2,039,669)
Beginning balance (in shares) at Jan. 31, 2025			508,680	82,453	508,680	82,453
Beginning Balance (in shares) at Jan. 31, 2025		(37,621)					(37,621)
Beginning 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)					851
Issuance of common stock upon exercise of stock options		301						301
Issuance of common stock upon settlement of restricted stock units (in shares)					3,127
Conversion of Class B common stock into Class A common stock (in shares)					5,000	(5,000)
Tax withholdings on settlement of restricted stock units (in shares)					(1,026)
Tax withholdings on settlement of restricted stock units		(10,566)						(10,566)
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)							(21,875)
Repurchase of Class A common stock		(229,445)					$ (229,445)
Stock-based compensation		76,364						76,364
Other comprehensive income (loss), net		34,413							34,413
Net income (loss)		(22,555)								(22,555)
Ending balance (in shares) at Apr. 30, 2025					516,913	77,453
Ending Balance (in shares) at Apr. 30, 2025							(59,496)
Ending balance at Apr. 30, 2025		$ 1,698,461			$ 5	$ 1	$ (724,224)	4,403,586	29,523	(2,010,430)
Beginning balance (in shares) at Jan. 31, 2025			508,680	82,453	508,680	82,453
Beginning Balance (in shares) at Jan. 31, 2025		(37,621)					(37,621)
Beginning 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)		3,115
Conversion of Class B common stock into Class A common stock (in shares)					8,100	(8,100)
Charitable donation of Class A common stock (in shares)					300
Repurchase of Class A common stock (in shares)		(30,200)
Other comprehensive income (loss), net		$ 32,580
Net income (loss)		$ 177,868	$ 152,277	$ 25,591
Ending balance (in shares) at Oct. 31, 2025			528,120	74,306	528,120	74,306
Ending Balance (in shares) at Oct. 31, 2025		(67,772)					(67,772)
Ending balance at Oct. 31, 2025		$ 1,924,617			$ 5	$ 1	$ (824,329)	4,531,257	27,690	(1,810,007)
Beginning balance (in shares) at Apr. 30, 2025					516,913	77,453
Beginning Balance (in shares) at Apr. 30, 2025							(59,496)
Beginning balance at Apr. 30, 2025		1,698,461			$ 5	$ 1	$ (724,224)	4,403,586	29,523	(2,010,430)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock options (in shares)					818
Issuance of common stock upon exercise of stock options		222						222
Issuance of common stock upon settlement of restricted stock units (in shares)					3,911
Tax withholdings on settlement of restricted stock units (in shares)					(1,242)
Tax withholdings on settlement of restricted stock units		(15,895)						(15,895)
Repurchase of Class A common stock (in shares)							(8,276)
Repurchase of Class A common stock		(100,618)					$ (100,618)
Issuance of common stock under employee stock purchase plan (in shares)					776
Issuance of common stock under employee stock purchase plan		8,719						8,719
Stock-based compensation		78,006						78,006
Other comprehensive income (loss), net		(4,776)							(4,776)
Net income (loss)		1,584								1,584
Ending balance (in shares) at Jul. 31, 2025					521,176	77,453
Ending Balance (in shares) at Jul. 31, 2025							(67,772)
Ending balance at Jul. 31, 2025		1,665,703			$ 5	$ 1	$ (824,842)	4,474,638	24,747	(2,008,846)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock options (in shares)					1,446
Issuance of common stock upon exercise of stock options		443						443
Issuance of common stock upon settlement of restricted stock units (in shares)					3,494
Conversion of Class B common stock into Class A common stock (in shares)					3,147	(3,147)
Tax withholdings on settlement of restricted stock units (in shares)					(1,143)
Tax withholdings on settlement of restricted stock units		(15,299)						(15,299)
Repurchase of Class A common stock	[1]	513					$ 513
Stock-based compensation		71,475						71,475
Other comprehensive income (loss), net		2,943							2,943
Net income (loss)		$ 198,839	$ 170,633	$ 28,206						198,839
Ending balance (in shares) at Oct. 31, 2025			528,120	74,306	528,120	74,306
Ending Balance (in shares) at Oct. 31, 2025		(67,772)					(67,772)
Ending balance at Oct. 31, 2025		$ 1,924,617			$ 5	$ 1	$ (824,329)	$ 4,531,257	$ 27,690	$ (1,810,007)

[1] (1) Adjustment of excise tax accrual related to year-to-date repurchases of Class A common stock