Net Income per Share - Numerators and Denominators of the Basic and Diluted EPS Computations for Common Stock (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2023	Oct. 31, 2022	Oct. 31, 2023	Oct. 31, 2022
Schedule Of Earnings Per Share Basic And Diluted [Line Items]
Weighted average shares used in computing net income per share, basic (in shares)	160,768	155,392	160,344	154,958
Net income per share, basic (in usd per share)	$ 0.84	$ 0.70	$ 2.36	$ 1.93
Reallocation as a result of conversion of Class B to Class A common stock:
Weighted average shares used in computing net income per share, diluted (in shares)	163,761	162,295	163,129	162,189
Net income per share, diluted (in usd per share)	$ 0.83	$ 0.67	$ 2.32	$ 1.84
Class A common stock
Schedule Of Earnings Per Share Basic And Diluted [Line Items]
Net income, basic	$ 124,569	$ 98,151	$ 345,597	$ 270,666
Weighted average shares used in computing net income per share, basic (in shares)	148,172	140,626	146,480	140,193
Net income per share, basic (in usd per share)	$ 0.84	$ 700	$ 2.36	$ 1.93
Reallocation as a result of conversion of Class B to Class A common stock:
Net income, basic	$ 10,589	$ 10,306	$ 32,710	$ 28,507
Reallocation of net income to Class B common stock	0	0	0	0
Net income, diluted	$ 135,158	$ 108,457	$ 378,307	$ 299,173
Conversion of Class B to Class A common stock (in shares)	12,596	14,766	13,864	14,765
Effect of potentially dilutive common shares (in shares)	2,993	6,903	2,785	7,231
Weighted average shares used in computing net income per share, diluted (in shares)	163,761	162,295	163,129	162,189
Net income per share, diluted (in usd per share)	$ 0.83	$ 0.67	$ 2.32	$ 1.84
Class B common stock
Schedule Of Earnings Per Share Basic And Diluted [Line Items]
Net income, basic	$ 10,589	$ 10,306	$ 32,710	$ 28,507
Weighted average shares used in computing net income per share, basic (in shares)	12,596	14,766	13,864	14,765
Net income per share, basic (in usd per share)	$ 0.84	$ 700	$ 2.36	$ 1.93
Reallocation as a result of conversion of Class B to Class A common stock:
Net income, basic	$ 0	$ 0	$ 0	$ 0
Reallocation of net income to Class B common stock	2,277	4,175	5,901	12,067
Net income, diluted	$ 12,866	$ 14,481	$ 38,611	$ 40,574
Conversion of Class B to Class A common stock (in shares)	0	0	0	0
Effect of potentially dilutive common shares (in shares)	2,993	6,903	2,785	7,231
Weighted average shares used in computing net income per share, diluted (in shares)	15,589	21,669	16,649	21,996
Net income per share, diluted (in usd per share)	$ 0.83	$ 0.67	$ 2.32	$ 1.84