CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY (Unaudited) - 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, 2021		152,056,808
Beginning 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)		485,037
Issuance of common stock upon exercise of stock options	17,600		17,600
Issuance of common stock upon vesting of restricted stock units (in shares)		258,511
Stock-based compensation expense	48,793		48,793
Change in other comprehensive loss	(3,296)				(3,296)
Net income	115,567			115,567
Ending balance (in shares) at Apr. 30, 2021		152,800,356
Ending balance at Apr. 30, 2021	2,444,984	$ 2	1,032,063	1,415,223	(2,304)
Beginning balance (in shares) at Jan. 31, 2022		154,196,597
Beginning 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)	482,436	482,436
Issuance of common stock upon exercise of stock options	$ 16,291		16,291
Issuance of common stock upon vesting of restricted stock units (in shares)		185,800
Shares withheld related to net share settlement (in shares)		(66,873)
Shares withheld related to net share settlement	(14,910)		(14,910)
Stock-based compensation expense	67,395		67,395
Change in other comprehensive loss	(12,253)				(12,253)
Net income	100,115			100,115
Ending balance (in shares) at Apr. 30, 2022		154,797,960
Ending balance at Apr. 30, 2022	$ 3,068,275	$ 2	$ 1,265,323	$ 1,827,161	$ (24,211)