Stockholders' Equity (Details) $ / shares in Units, $ in Thousands	1 Months Ended	3 Months Ended		9 Months Ended		12 Months Ended
	Oct. 31, 2019 USD ($) $ / shares shares	Jan. 31, 2021 USD ($) vote $ / shares shares	Jan. 31, 2020 USD ($)	Jan. 31, 2021 USD ($) vote $ / shares shares	Jan. 31, 2020 USD ($)	Apr. 30, 2020 $ / shares shares	Nov. 30, 2020 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Preferred stock, shares authorized (in shares)		200,000,000		200,000,000
Preferred stock, par value (in dollars per share) | $ / shares		$ 0.001		$ 0.001
Preferred stock, shares issued (in shares)		0		0
Preferred stock, shares outstanding (in shares)		0		0
Automatic conversion period, following the death or incapacity of Mr. Siebel				6 months
Automatic conversion period, following the date Mr. Siebel no longer providing services				6 months
Automatic conversion, anniversary period, if circumstances met				20 years
Net proceeds common stock exercised prior to vesting | $		$ 4,500	$ 300	$ 6,000	$ 1,600
Stock repurchased in period, per share (in dollars per share) | $ / shares	$ 30.2310
Net transaction price | $	$ 28,500				3,548
Compensation expense | $					$ 24,900
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares subject to repurchase right (in shares)				1,300,185		663,763
Stock repurchased in period (in shares)	811,189
Class A Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, shares authorized (in shares)		1,000,000,000		1,000,000,000		390,000,000	390,000,000
Voting rights, number of votes for each share | vote		1		1
Common stock, par value (in dollars per share) | $ / shares		$ 0.001		$ 0.001		$ 0.001
Stock repurchased in period (in shares)	163,685
Class B Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, shares authorized (in shares)		3,500,000		3,500,000		21,000,000	21,000,000
Voting rights, number of votes for each share | vote		50		50
Common stock, par value (in dollars per share) | $ / shares		$ 0.001		$ 0.001		$ 0.001