Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Class A & B common stock	Additional paid-in capital	Retained earnings	Accumulated other comprehensive income (loss)
Beginning balance (in shares) at Jan. 31, 2020		149,095,583
Beginning balance at Jan. 31, 2020	$ 1,665,594	$ 1	$ 745,475	$ 919,658	$ 460
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock options (in shares)		1,839,723
Issuance of common stock upon    exercise of stock options	34,816	$ 1	34,815
Issuance of common stock upon vesting of restricted stock units (in shares)		1,121,502
Stock-based compensation expense	185,380		185,380
Other comprehensive income (loss)	532				532
Net income	379,998			379,998
Ending balance (in shares) at Jan. 31, 2021		152,056,808
Ending balance at Jan. 31, 2021	2,266,320	$ 2	965,670	1,299,656	992
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock options (in shares)		1,476,898
Issuance of common stock upon    exercise of stock options	51,538		51,538
Issuance of common stock upon vesting of restricted stock units (in shares)		854,536
Shares withheld related to net share settlement (in shares)		(191,645)
Shares withheld related to net share settlement	(56,398)		(56,398)
Stock-based compensation expense	235,737		235,737
Other comprehensive income (loss)	(12,950)				(12,950)
Net income	427,390			427,390
Ending balance (in shares) at Jan. 31, 2022		154,196,597
Ending balance at Jan. 31, 2022	$ 2,911,637	$ 2	1,196,547	1,727,046	(11,958)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock options (in shares)	3,421,303	3,421,303
Issuance of common stock upon    exercise of stock options	$ 43,654		43,654
Issuance of common stock upon vesting of restricted stock units (in shares)		968,004
Shares withheld related to net share settlement (in shares)		(341,297)
Shares withheld related to net share settlement	(63,654)		(63,654)
Stock-based compensation expense	356,080		356,080
Other comprehensive income (loss)	(19,171)				(19,171)
Net income	487,706			487,706
Ending balance (in shares) at Jan. 31, 2023		158,244,607
Ending balance at Jan. 31, 2023	$ 3,716,252	$ 2	$ 1,532,627	$ 2,214,752	$ (31,129)