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		9 Months Ended
	Oct. 31, 2021	Oct. 31, 2020	Oct. 31, 2021	Oct. 31, 2020
Numerator:
Net income	$ 340,383	$ 198,642	$ 884,998	$ 411,706
Net income attributable to common stockholders	$ 340,271	$ 198,440	$ 884,568	$ 411,175
Denominator:
Weighted-average shares used in computing net income per share attributable to common stockholders, basic (in shares)	297,375,011	284,783,006	295,647,626	282,564,481
Weighted-average shares used in computing net income per share attributable to common stockholders, diluted (in shares)	305,939,624	299,258,765	305,726,733	297,605,941
Net income per share attributable to common stockholders, basic (in dollars per share)	$ 1.14	$ 0.70	$ 2.99	$ 1.46
Net income per share attributable to common stockholders, diluted (in dollars per share)	$ 1.11	$ 0.66	$ 2.89	$ 1.38
Class A Common Stock
Numerator:
Net income	$ 276,024	$ 136,849	$ 707,188	$ 256,176
Less: undistributed earnings attributable to participating securities		0	0	0
Net income attributable to common stockholders	276,024	136,849	707,188	256,176
Reallocation of net income attributable to common stockholders	(5,756)	(4,094)	(15,965)	(9,083)
Net income (loss) attributable to common stockholders, diluted	$ 270,268	$ 132,755	$ 691,223	$ 247,093
Denominator:
Weighted-average shares used in computing net income per share attributable to common stockholders, basic (in shares)	241,227,457	196,393,625	236,362,585	176,047,037
Weighted-average shares used in computing net income per share attributable to common stockholders, diluted (in shares)	243,024,399	200,202,338	238,904,473	178,844,073
Net income per share attributable to common stockholders, basic (in dollars per share)	$ 1.14	$ 0.70	$ 2.99	$ 1.46
Net income per share attributable to common stockholders, diluted (in dollars per share)	$ 1.11	$ 0.66	$ 2.89	$ 1.38
Class B Common Stock
Numerator:
Net income	$ 64,359	$ 61,793	$ 177,810	$ 155,530
Less: undistributed earnings attributable to participating securities	(112)	(202)	(430)	(531)
Net income attributable to common stockholders	64,247	61,591	177,380	154,999
Reallocation of net income attributable to common stockholders	5,756	4,094	15,965	9,083
Net income (loss) attributable to common stockholders, diluted	$ 70,003	$ 65,685	$ 193,345	$ 164,082
Denominator:
Weighted-average shares used in computing net income per share attributable to common stockholders, basic (in shares)	56,147,554	88,389,381	59,285,041	106,517,444
Weighted-average shares used in computing net income per share attributable to common stockholders, diluted (in shares)	62,915,225	99,056,427	66,822,260	118,761,868
Net income per share attributable to common stockholders, basic (in dollars per share)	$ 1.14	$ 0.70	$ 2.99	$ 1.46
Net income per share attributable to common stockholders, diluted (in dollars per share)	$ 1.11	$ 0.66	$ 2.89	$ 1.38