Employee Incentive Plans - Narrative (Details) $ / shares in Units, $ in Thousands		12 Months Ended
	May 03, 2021 shares	Jan. 31, 2022 USD ($) incentive_plan offering_period $ / shares shares	Jan. 31, 2021 USD ($) $ / shares shares	Jan. 31, 2020 USD ($) $ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of equity incentive plans | incentive_plan		2
Options to purchase common stock outstanding (in shares)		7,984,078	8,250,113
Weighted average grant date fair value of options granted (in dollars per share) | $ / shares		$ 211.58	$ 63.32	$ 37.35
Grant date fair value of vested stock options | $		$ 314,200	$ 19,700	$ 23,700
Intrinsic value of options exercised | $		544,800	772,300	558,600
Unrecognized stock-based compensation expense | $		$ 209,600	31,100
Number of options, granted (in shares)		2,565,055
Options granted, weighted average exercise price (in dollars per share) | $ / shares		$ 93.95
Issuance of common stock under employee stock purchase plan, net of cancellations | $		$ 35,568	$ 25,911	18,767
Auth0
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options, granted (in shares)		1,850,079
Options granted, weighted average exercise price (in dollars per share) | $ / shares		$ 24.21
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration period (years)		10 years
Vesting period		4 years
Weighted average stock-based compensation recognition period		2 years 4 months 24 days	2 years 4 months 24 days
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average stock-based compensation recognition period		2 years 10 months 24 days
Granted during period (in shares)		5,110,925
Shares issued fair value | $		$ 1,209,100
Unrecognized compensation costs related to unvested restricted stock units | $		1,152,300	$ 502,800
Fair value of units vested | $		$ 531,400	410,400	$ 193,900
Granted during period (in dollars per share) | $ / shares		$ 236.57
RSUs | Auth0
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted during period (in shares)		743,718
Granted during period (in dollars per share) | $ / shares		$ 269.70
ESPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average stock-based compensation recognition period		8 months 12 days
Unrecognized compensation costs related to unvested restricted stock units | $		$ 16,500	$ 10,100
ESPP offering period		12 months
Number of offering periods | offering_period		2
ESPP length of purchase period		6 months
Number of shares issued under ESPP		185,707	247,142
Weighted average price, shares issued under ESPP (in dollars per share) | $ / shares		$ 191.54	$ 104.84
Unvested restricted stock awards issued and outstanding | Auth0
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Granted during period (in shares)	1,200,000
Unvested restricted stock awards issued and outstanding | Auth0 and atSpoke
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period		3 years
Weighted average stock-based compensation recognition period		2 years 3 months 18 days
Granted during period (in shares)		1,269,008
Unrecognized compensation costs related to unvested restricted stock units | $		$ 257,000
Granted during period (in dollars per share) | $ / shares		$ 268.98
2017 Equity Incentive Plan | Class A Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options to purchase common stock outstanding (in shares)		2,339,467
2017 Equity Incentive Plan | Class B Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options to purchase common stock outstanding (in shares)		5,644,611
Vesting tranche one | Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period		1 year
Vesting percentage earned by employees after each completed year of service		25.00%