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	3 Months Ended		6 Months Ended
	Jul. 31, 2021	Jul. 31, 2020	Jul. 31, 2021	Jul. 31, 2020
Numerator:
Net income	$ 317,084	$ 185,989	$ 544,615	$ 213,064
Net income attributable to common stockholders	$ 316,930	$ 185,742	$ 544,306	$ 212,759
Denominator:
Weighted-average shares used in computing net income per share attributable to common stockholders, basic (in shares)	295,712,675	282,850,805	294,769,619	281,394,901
Weighted-average shares used in computing net income per share attributable to common stockholders, diluted (in shares)	305,861,051	297,162,309	305,652,628	296,408,229
Net income per share attributable to common stockholders, basic (in dollars per share)	$ 1.07	$ 0.66	$ 1.85	$ 0.76
Net income per share attributable to common stockholders, diluted (in dollars per share)	$ 1.04	$ 0.63	$ 1.78	$ 0.72
Class A Common Stock
Numerator:
Net income	$ 255,513	$ 122,474	$ 431,889	$ 125,297
Less: undistributed earnings attributable to participating securities	0	0	0	0
Net income attributable to common stockholders	255,513	122,474	431,889	125,297
Reallocation of net income attributable to common stockholders	(5,738)	(4,343)	(10,105)	(4,824)
Net income (loss) attributable to common stockholders, diluted	$ 249,775	$ 118,131	$ 421,784	$ 120,473
Denominator:
Weighted-average shares used in computing net income per share attributable to common stockholders, basic (in shares)	238,407,148	186,505,788	233,889,833	165,718,132
Weighted-average shares used in computing net income per share attributable to common stockholders, diluted (in shares)	241,051,560	188,994,684	236,850,849	167,839,216
Net income per share attributable to common stockholders, basic (in dollars per share)	$ 1.07	$ 0.66	$ 1.85	$ 0.76
Net income per share attributable to common stockholders, diluted (in dollars per share)	$ 1.04	$ 0.63	$ 1.78	$ 0.72
Class B Common Stock
Numerator:
Net income	$ 61,571	$ 63,515	$ 112,726	$ 87,767
Less: undistributed earnings attributable to participating securities	(154)	(247)	(309)	(305)
Net income attributable to common stockholders	61,417	63,268	112,417	87,462
Reallocation of net income attributable to common stockholders	5,738	4,343	10,105	4,824
Net income (loss) attributable to common stockholders, diluted	$ 67,155	$ 67,611	$ 122,522	$ 92,286
Denominator:
Weighted-average shares used in computing net income per share attributable to common stockholders, basic (in shares)	57,305,527	96,345,017	60,879,786	115,676,769
Weighted-average shares used in computing net income per share attributable to common stockholders, diluted (in shares)	64,809,491	108,167,625	68,801,779	128,569,013
Net income per share attributable to common stockholders, basic (in dollars per share)	$ 1.07	$ 0.66	$ 1.85	$ 0.76
Net income per share attributable to common stockholders, diluted (in dollars per share)	$ 1.04	$ 0.63	$ 1.78	$ 0.72