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, 2025	Jan. 31, 2024	Jan. 31, 2023
Numerator:
Net income	$ 1,010,238	$ 637,462	$ 103,711
Less: undistributed earnings attributable to participating securities	0	0	(7)
Net income attributable to common stockholders, basic	$ 1,010,238	$ 637,462	$ 103,704
Denominator:
Weighted-average shares used in computing net income per share attributable to common stockholders, basic (in shares)	307,981,971	300,748,162	296,560,501
Weighted-average shares used in computing net income per share attributable to common stockholders, diluted (in shares)	315,069,582	308,519,897	304,231,350
Net income per share attributable to common stockholders, basic (in dollars per share)	$ 3.28	$ 2.12	$ 0.35
Net income per share attributable to common stockholders, diluted (in dollars per share)	$ 3.21	$ 2.07	$ 0.34
Class A
Numerator:
Net income	$ 861,755	$ 538,554	$ 87,246
Less: undistributed earnings attributable to participating securities	0	0	0
Net income attributable to common stockholders, basic	861,755	538,554	87,246
Reallocation of net income attributable to common stockholders	(5,170)	(4,653)	(1,205)
Net income attributable to common stockholders, diluted	$ 856,585	$ 533,901	$ 86,041
Denominator:
Weighted-average shares used in computing net income per share attributable to common stockholders, basic (in shares)	262,715,505	254,084,540	249,494,904
Weighted-average shares used in computing net income per share attributable to common stockholders, diluted (in shares)	267,148,873	258,398,674	252,413,234
Net income per share attributable to common stockholders, basic (in dollars per share)	$ 3.28	$ 2.12	$ 0.35
Net income per share attributable to common stockholders, diluted (in dollars per share)	$ 3.21	$ 2.07	$ 0.34
Class B
Numerator:
Net income	$ 148,483	$ 98,908	$ 16,465
Less: undistributed earnings attributable to participating securities	0	0	(7)
Net income attributable to common stockholders, basic	148,483	98,908	16,458
Reallocation of net income attributable to common stockholders	5,170	4,653	1,205
Net income attributable to common stockholders, diluted	$ 153,653	$ 103,561	$ 17,663
Denominator:
Weighted-average shares used in computing net income per share attributable to common stockholders, basic (in shares)	45,266,466	46,663,622	47,065,597
Weighted-average shares used in computing net income per share attributable to common stockholders, diluted (in shares)	47,920,709	50,121,223	51,818,116
Net income per share attributable to common stockholders, basic (in dollars per share)	$ 3.28	$ 2.12	$ 0.35
Net income per share attributable to common stockholders, diluted (in dollars per share)	$ 3.21	$ 2.07	$ 0.34