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
	Apr. 30, 2021	Apr. 30, 2020
Numerator:
Net income	$ 227,531	$ 27,075
Net income attributable to common stockholders	$ 227,383	$ 27,036
Denominator:
Weighted-average shares used in computing net income per share attributable to common stockholders, basic (in shares)	293,794,778	279,891,111
Weighted-average shares used in computing net income per share attributable to common stockholders, diluted (in shares)	305,412,419	295,184,958
Net income per share attributable to common stockholders, basic (in dollars per share)	$ 0.77	$ 0.10
Net income per share attributable to common stockholders, diluted (in dollars per share)	$ 0.74	$ 0.09
Class A Common Stock
Numerator:
Net income	$ 177,405	$ 14,007
Less: undistributed earnings attributable to participating securities	0	0
Net income attributable to common stockholders	177,405	14,007
Reallocation of net income attributable to common stockholders	(4,308)	(591)
Net income (loss) attributable to common stockholders, diluted	$ 173,097	$ 13,416
Denominator:
Weighted-average shares used in computing net income per share attributable to common stockholders, basic (in shares)	229,220,253	145,004,142
Weighted-average shares used in computing net income per share attributable to common stockholders, diluted (in shares)	232,497,872	146,472,265
Net income per share attributable to common stockholders, basic (in dollars per share)	$ 0.77	$ 0.10
Net income per share attributable to common stockholders, diluted (in dollars per share)	$ 0.74	$ 0.09
Class B Common Stock
Numerator:
Net income	$ 50,126	$ 13,068
Less: undistributed earnings attributable to participating securities	(148)	(39)
Net income attributable to common stockholders	49,978	13,029
Reallocation of net income attributable to common stockholders	4,308	591
Net income (loss) attributable to common stockholders, diluted	$ 54,286	$ 13,620
Denominator:
Weighted-average shares used in computing net income per share attributable to common stockholders, basic (in shares)	64,574,525	134,886,969
Weighted-average shares used in computing net income per share attributable to common stockholders, diluted (in shares)	72,914,547	148,712,693
Net income per share attributable to common stockholders, basic (in dollars per share)	$ 0.77	$ 0.10
Net income per share attributable to common stockholders, diluted (in dollars per share)	$ 0.74	$ 0.09