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, 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)		2,205,249
Issuance of common stock upon exercise of stock options	11,362	$ 3	11,359
Issuance of common stock upon release of restricted stock units (in shares)		1,480,536
Issuance of common stock upon release of restricted stock units	1	$ 1
Issuance of common stock for employee stock purchase plan (in shares)		701,949
Issuance of common stock for employee stock purchase plan	37,846	$ 1	37,845
Stock-based compensation expense	324,678		324,678
Other comprehensive loss	(5,967)			(5,967)
Net income	884,998				884,998
Ending balance (in shares) at Oct. 31, 2021		297,936,957
Ending balance at Oct. 31, 2021	5,113,685	$ 297	3,561,050	(5,128)	1,557,466
Beginning balance (in shares) at Jul. 31, 2021		297,027,323
Beginning balance at Jul. 31, 2021	4,657,748	$ 296	3,440,222	147	1,217,083
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock options (in shares)		612,056
Issuance of common stock upon exercise of stock options	3,125	$ 1	3,124
Issuance of common stock upon release of restricted stock units (in shares)		297,578
Issuance of common stock upon release of restricted stock units	0	$ 0
Stock-based compensation expense	117,704		117,704
Other comprehensive loss	(5,275)			(5,275)
Net income	340,383				340,383
Ending balance (in shares) at Oct. 31, 2021		297,936,957
Ending balance at Oct. 31, 2021	5,113,685	$ 297	3,561,050	(5,128)	1,557,466
Beginning balance (in shares) at Jan. 31, 2022		299,037,805
Beginning 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)	1,087,238	1,087,238
Issuance of common stock upon exercise of stock options	$ 7,052	$ 1	7,051
Issuance of common stock upon release of restricted stock units (in shares)		2,865,551
Issuance of common stock upon release of restricted stock units	0	$ 3	(3)
Issuance of common stock for employee stock purchase plan (in shares)		373,259
Issuance of common stock for employee stock purchase plan	34,604		34,604
Repurchase of common stock (in shares)		(11,044,500)
Repurchase of common stock	(990,778)	$ (11)	(990,767)
Stock-based compensation expense	771,969		771,969
Other comprehensive loss	(54,814)			(54,814)
Net income	207,761				207,761
Ending balance (in shares) at Oct. 31, 2022		292,319,353
Ending balance at Oct. 31, 2022	5,755,812	$ 292	3,572,368	(72,716)	2,255,868
Beginning balance (in shares) at Jul. 31, 2022		298,086,507
Beginning balance at Jul. 31, 2022	5,990,397	$ 298	3,830,745	(48,161)	2,207,515
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock options (in shares)		229,183
Issuance of common stock upon exercise of stock options	1,809		1,809
Issuance of common stock upon release of restricted stock units (in shares)		959,192
Issuance of common stock upon release of restricted stock units	0	$ 1	(1)
Repurchase of common stock (in shares)		(6,955,529)
Repurchase of common stock	(564,832)	$ (7)	(564,825)
Stock-based compensation expense	304,640		304,640
Other comprehensive loss	(24,555)			(24,555)
Net income	48,353				48,353
Ending balance (in shares) at Oct. 31, 2022		292,319,353
Ending balance at Oct. 31, 2022	$ 5,755,812	$ 292	$ 3,572,368	$ (72,716)	$ 2,255,868