Stockholders’ Equity and Equity Incentive Plans - Additional Information (Details)	3 Months Ended	6 Months Ended
	Jul. 31, 2026 USD ($) plan $ / shares shares	Jul. 31, 2026 USD ($) plan $ / shares shares	May 31, 2026 USD ($)	Jan. 31, 2026 $ / shares shares
Class of Stock [Line Items]
Common stock, par value (in dollars per share) | $ / shares	$ 0.001	$ 0.001		$ 0.001
Remaining authorized repurchase amount	$ 1,300,000,000	$ 1,300,000,000
Number of equity incentive plans | plan	2	2
Unrecognized stock-based compensation expenses related to outstanding unvested stock options (in shares)	$ 0	$ 0
RSUs
Class of Stock [Line Items]
Unrecognized stock-based compensation expenses	1,440,200,000	$ 1,440,200,000
Unrecognized stock-based compensation excepted to be recognized over a weighted-average period (in years)		2 years 10 months 24 days
ESPP
Class of Stock [Line Items]
Unrecognized stock-based compensation expenses	$ 54,300,000	$ 54,300,000
Unrecognized stock-based compensation excepted to be recognized over a weighted-average period (in years)		1 year 9 months 18 days
Class A
Class of Stock [Line Items]
Common stock, shares authorized (in shares) | shares	2,000,000,000	2,000,000,000		2,000,000,000
Common stock, par value (in dollars per share) | $ / shares	$ 0.001	$ 0.001
Stock repurchase program, additional amount authorized			$ 1,000,000,000.0
Stock repurchase program, amount authorized			$ 4,700,000,000
Stock repurchased and retired (in shares) | shares	3,740,213	7,909,421
Stock repurchased and retired	$ 351,900,000	$ 713,500,000
Class B
Class of Stock [Line Items]
Common stock, shares authorized (in shares) | shares	300,000,000	300,000,000		300,000,000
Common stock, par value (in dollars per share) | $ / shares	$ 0.001	$ 0.001