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
	Apr. 30, 2023	Apr. 30, 2022
Schedule Of Earnings Per Share Basic And Diluted [Line Items]
Weighted average shares used in computing net income per share, basic (in shares)	159,852	154,514
Net income per share, basic (in usd per share)	$ 0.82	$ 0.65
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)	162,521	161,928
Net income per share, diluted (in usd per share)	$ 0.81	$ 0.62
Class A common stock
Schedule Of Earnings Per Share Basic And Diluted [Line Items]
Net income, basic	$ 119,574	$ 90,548
Weighted average shares used in computing net income per share, basic (in shares)	145,332	139,749
Net income per share, basic (in usd per share)	$ 0.82	$ 650
Reallocation as a result of conversion of Class B to Class A common stock:
Net income, basic	$ 11,947	$ 9,567
Reallocation of net income to Class B common stock	0	0
Net income, diluted	$ 131,521	$ 100,115
Conversion of Class B to Class A common stock (in shares)	14,520	14,765
Effect of potentially dilutive common shares (in shares)	2,669	7,414
Weighted average shares used in computing net income per share, diluted (in shares)	162,521	161,928
Net income per share, diluted (in usd per share)	$ 0.81	$ 0.62
Class B common stock
Schedule Of Earnings Per Share Basic And Diluted [Line Items]
Net income, basic	$ 11,947	$ 9,567
Weighted average shares used in computing net income per share, basic (in shares)	14,520	14,765
Net income per share, basic (in usd per share)	$ 0.82	$ 650
Reallocation as a result of conversion of Class B to Class A common stock:
Net income, basic	$ 0	$ 0
Reallocation of net income to Class B common stock	1,964	4,146
Net income, diluted	$ 13,911	$ 13,713
Conversion of Class B to Class A common stock (in shares)	0	0
Effect of potentially dilutive common shares (in shares)	2,669	7,414
Weighted average shares used in computing net income per share, diluted (in shares)	17,189	22,179
Net income per share, diluted (in usd per share)	$ 0.81	$ 0.62