Net Income Per Share Attributable to Common Stockholders - Schedule of Computation of Basic and Diluted Net Income Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Jan. 31, 2022	Jan. 31, 2021	Jan. 31, 2020
Earnings Per Share, Basic [Abstract]
Net income	$ 1,375,639	$ 672,316	$ 25,305
Less: undistributed earnings attributable to participating securities	(582)	(789)	(3,555)
Net income attributable to common stockholders	$ 1,375,057	$ 671,527	$ 21,750
Earnings Per Share, Diluted [Abstract]
Weighted-average shares used in computing net income (loss) per share attributable to common stockholders, basic (in shares)	296,334,894	283,853,654	233,641,336
Weighted-average shares used in computing net income (loss) per share attributable to common stockholders, diluted (in shares)	305,826,505	298,127,669	254,298,014
Net income (loss) per share attributable to common stockholders, basic (in dollars per share)	$ 4.64	$ 2.37	$ 0.09
Net income (loss) per share attributable to common stockholders, diluted (in dollars per share)	$ 4.50	$ 2.25	$ 0.09
Class A Common Stock
Earnings Per Share, Basic [Abstract]
Net income	$ 1,105,368	$ 432,968	$ 5,450
Less: undistributed earnings attributable to participating securities	0	0	0
Net income attributable to common stockholders	1,105,368	432,968	5,450
Reallocation of net income attributable to common stockholders	(23,891)	(14,321)	(439)
Net income attributable to common stockholders, diluted	$ 1,081,477	$ 418,647	$ 5,011
Earnings Per Share, Diluted [Abstract]
Weighted-average shares used in computing net income (loss) per share attributable to common stockholders, basic (in shares)	238,214,936	183,015,245	58,541,269
Weighted-average shares used in computing net income (loss) per share attributable to common stockholders, diluted (in shares)	240,531,470	185,860,412	58,583,874
Net income (loss) per share attributable to common stockholders, basic (in dollars per share)	$ 4.64	$ 2.37	$ 0.09
Net income (loss) per share attributable to common stockholders, diluted (in dollars per share)	$ 4.50	$ 2.25	$ 0.09
Class B Common Stock
Earnings Per Share, Basic [Abstract]
Net income	$ 270,271	$ 239,348	$ 19,855
Less: undistributed earnings attributable to participating securities	(582)	(789)	(3,555)
Net income attributable to common stockholders	269,689	238,559	16,300
Reallocation of net income attributable to common stockholders	23,891	14,321	439
Net income attributable to common stockholders, diluted	$ 293,580	$ 252,880	$ 16,739
Earnings Per Share, Diluted [Abstract]
Weighted-average shares used in computing net income (loss) per share attributable to common stockholders, basic (in shares)	58,119,958	100,838,409	175,100,067
Weighted-average shares used in computing net income (loss) per share attributable to common stockholders, diluted (in shares)	65,295,035	112,267,257	195,714,140
Net income (loss) per share attributable to common stockholders, basic (in dollars per share)	$ 4.64	$ 2.37	$ 0.09
Net income (loss) per share attributable to common stockholders, diluted (in dollars per share)	$ 4.50	$ 2.25	$ 0.09