Equity - Narrative (Details) $ / shares in Units, $ in Thousands						1 Months Ended			2 Months Ended	12 Months Ended			33 Months Ended
	Mar. 31, 2022 USD ($) founder shares	Feb. 01, 2022 shares	Mar. 03, 2021 shares	Mar. 01, 2021 vote $ / shares shares	Feb. 28, 2021 vote	Sep. 30, 2020 USD ($) class $ / shares shares	Mar. 31, 2020 shares	Dec. 31, 2017 $ / shares shares	Jun. 30, 2020 USD ($)	Jan. 31, 2023 USD ($) founder $ / shares shares	Jan. 31, 2022 USD ($) $ / shares shares	Jan. 31, 2021 USD ($) $ / shares shares	Jan. 31, 2023 USD ($) $ / shares shares	Feb. 29, 2020 $ / shares	Jan. 31, 2020 shares
Share-based Compensation Arrangement by Share-based Payment Award
Preferred stock, shares authorized (in shares)						200,000,000				200,000,000	200,000,000		200,000,000
Preferred stock, par value (in dollars per share) | $ / shares						$ 0.0001				$ 0.0001	$ 0.0001		$ 0.0001
Common stock, number of classes of stock | class						2
Conversion, percent threshold					10.00%
Common stock reserved for future issuances (shares)										115,449,000	105,310,000		115,449,000
Shares authorized (in shares)										15,619,000	14,397,000	54,970,000
Options granted (shares)										642,000	0	877,000
Granted (per share) | $ / shares										$ 101.66		$ 22.67
Intrinsic value of shares exercised | $										$ 1,000,000	$ 5,700,000	$ 2,000,000
Grant date fair value of vested shares | $										79,100	81,000	90,900
Stock-based compensation, net of amounts capitalized | $										861,533	605,095	301,441
Proceeds from repayments of a nonrecourse promissory note | $										0	$ 0	$ 2,090
Unrecognized share-based compensation expense | $										$ 2,400,000			$ 2,400,000
Unrecognized share-based compensation expense recognition period (term)										2 years 10 months 24 days
Streamlit, Inc.
Share-based Compensation Arrangement by Share-based Payment Award
Number of founders | founder	3									3
2020 Plan
Share-based Compensation Arrangement by Share-based Payment Award
Shares authorized (in shares)		15,600,000
Employee stock purchase rights under the 2020 ESPP
Share-based Compensation Arrangement by Share-based Payment Award
Common stock reserved for future issuances (shares)										11,046,000	8,209,000		11,046,000
Shares authorized (in shares)		3,100,000
Stock market discount										85.00%
Offering period										6 months
Stock options
Share-based Compensation Arrangement by Share-based Payment Award
Vesting period (years)										4 years
Expiration period (years)										10 years
RSUs
Share-based Compensation Arrangement by Share-based Payment Award
Vesting period (years)										4 years
Stock-based compensation, net of amounts capitalized | $						$ 55,500
Granted (shares)										10,788,000	4,026,000	9,553,000
Nonvested (in shares)										15,560,000	9,612,000	9,348,000	15,560,000		0
Vested (shares)										3,348,000	3,186,000	37,000
2020 Plan | Stock options
Share-based Compensation Arrangement by Share-based Payment Award
Common stock reserved for future issuances (shares)										642,000	0		642,000
2020 Plan | RSUs
Share-based Compensation Arrangement by Share-based Payment Award
Common stock reserved for future issuances (shares)										13,039,000	5,082,000		13,039,000
2012 Plan | Stock options
Share-based Compensation Arrangement by Share-based Payment Award
Common stock reserved for future issuances (shares)										35,212,000	42,043,000		35,212,000
Expiration period (years)										10 years
2012 Plan | RSUs
Share-based Compensation Arrangement by Share-based Payment Award
Common stock reserved for future issuances (shares)										2,521,000	4,530,000		2,521,000
Outside of the Plans | Restricted Common Stock
Share-based Compensation Arrangement by Share-based Payment Award
Granted (shares)										409,000
Nonvested (in shares)										428,000	380,000	742,000	428,000		1,604,000
Vested (shares)										361,000	362,000	862,000
Outside of the Plans | Restricted Common Stock | Promissory Notes
Share-based Compensation Arrangement by Share-based Payment Award
Vesting period (years)								5 years
Shares authorized (shares)								1,300,000
Shares issued (per share) | $ / shares								$ 1.59
Debt instrument, stated interest rate								2.11%
Proceeds from repayments of a nonrecourse promissory note | $									$ 2,100
Vested (shares)													1,300,000
Class A Common Stock
Share-based Compensation Arrangement by Share-based Payment Award
Common stock, shares authorized (in shares)						2,500,000,000				2,500,000,000	2,500,000,000		2,500,000,000
Common stock, par value (in dollars per share) | $ / shares				$ 0.0001						$ 0.0001	$ 0.0001		$ 0.0001
Common stock, voting rights, votes per share | vote				1
Class A Common Stock | Employee stock purchase rights under the 2020 ESPP
Share-based Compensation Arrangement by Share-based Payment Award
Common stock reserved for future issuances (shares)						5,700,000
Class A Common Stock | 2020 Plan
Share-based Compensation Arrangement by Share-based Payment Award
Common stock reserved for future issuances (shares)						34,100,000
Maximum common shares authorized to be outstanding (shares)						78,800,000
Class A Common Stock | Outside of the Plans | Restricted Common Stock | Streamlit, Inc.
Share-based Compensation Arrangement by Share-based Payment Award
Vesting period (years)										3 years
Granted (shares)	400,000
Post-combination share-based compensation arrangement by share-based payment award, equity instruments other than options, granted in period, total fair value | $	$ 93,700
Service period										3 years
Nonvested (in shares)										400,000			400,000
Class A Common Stock | IPO
Share-based Compensation Arrangement by Share-based Payment Award
Number of shares issued (in shares)						32,200,000
Price per share (in dollars per share) | $ / shares						$ 120.00
Net proceeds | $						$ 3,700,000
Class A Common Stock | Over-Allotment Option
Share-based Compensation Arrangement by Share-based Payment Award
Number of shares issued (in shares)						4,200,000
Class A Common Stock | Private Placement
Share-based Compensation Arrangement by Share-based Payment Award
Price per share (in dollars per share) | $ / shares						$ 120.00
Net proceeds | $						$ 500,000
Class A Common Stock | Private Placement | Berkshire Hathaway Inc.
Share-based Compensation Arrangement by Share-based Payment Award
Number of shares issued (in shares)						2,100,000
Class A Common Stock | Private Placement | Salesforce Ventures LLC
Share-based Compensation Arrangement by Share-based Payment Award
Number of shares issued (in shares)						2,100,000
Redeemable Convertible Preferred Stock
Share-based Compensation Arrangement by Share-based Payment Award
Conversion of redeemable convertible preferred stock to common stock upon initial public offering (in shares)						182,300,000						182,271,000
Class B Common Stock
Share-based Compensation Arrangement by Share-based Payment Award
Conversion ratio						1
Common stock, shares authorized (in shares)						355,000,000				185,461,000	185,461,000		185,461,000
Shares converted (in shares)			169,500,000	169,500,000
Common stock, par value (in dollars per share) | $ / shares				$ 0.0001						$ 0.0001	$ 0.0001		$ 0.0001
Common stock, voting rights, votes per share | vote					10
Shares issued (per share) | $ / shares														$ 38.77
Shares issued for common stock (shares)							8,600,000