Equity - Narrative (Details) $ / shares in Units, $ in Thousands			3 Months Ended			6 Months Ended
	Feb. 01, 2023 shares	Mar. 31, 2022 USD ($) founder shares	Jul. 31, 2023 USD ($) shares	Apr. 30, 2023 shares	Jul. 31, 2022 USD ($) shares	Jul. 31, 2023 USD ($) shares	Jul. 31, 2022 USD ($) founder $ / shares shares	Feb. 28, 2023 USD ($)	Jan. 31, 2023 shares
Share-based Compensation Arrangement by Share-based Payment Award
Stock repurchase program, authorized amount | $								$ 2,000,000
Number of shares repurchased (in shares)			0			1,405,000
Stock repurchase program, remaining authorized repurchase amount | $			$ 1,800,000			$ 1,800,000
Repurchases of common stock (in shares)						500,000
Additional shares authorized (in shares)				16,165,000
Options granted (shares)			0		0	0
Granted (per share) | $ / shares							$ 101.66
Intrinsic value of shares exercised | $						$ 736,700	$ 704,600
Grant date fair value of vested shares | $						28,300	41,300
Share-based compensation expense | $			$ 299,722		$ 209,181	$ 564,231	$ 381,674
Expected dividend yield						0.00%
Unrecognized share-based compensation expense | $			$ 3,000,000			$ 3,000,000
Unrecognized share-based compensation expense recognition period (term)						3 years
Streamlit, Inc.
Share-based Compensation Arrangement by Share-based Payment Award
Number of founders | founder		3					3
2020 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award
Additional shares authorized (in shares)	16,200,000
Employee stock purchase rights under the 2020 ESPP
Share-based Compensation Arrangement by Share-based Payment Award
Offering period						6 months
Additional shares authorized (in shares)	3,200,000
Expected dividend yield			0.00%		0.00%	0.00%	0.00%
Stock options
Share-based Compensation Arrangement by Share-based Payment Award
Vesting period (years)						4 years
Expiration period (years)						10 years
Expected dividend yield							0.00%
Stock options | 2012 Equity Incentive Plan:
Share-based Compensation Arrangement by Share-based Payment Award
Expiration period (years)						10 years
RSUs
Share-based Compensation Arrangement by Share-based Payment Award
Vesting period (years)						4 years
Granted (shares)			2,048,000	7,318,000
Share-based compensation arrangement by share-based payment award, equity instruments other than options, nonvested, number			20,497,000	20,544,000		20,497,000			15,560,000
RSUs | Grant Date
Share-based Compensation Arrangement by Share-based Payment Award
Vesting period (years)						1 year
RCS | Outside of the Plans
Share-based Compensation Arrangement by Share-based Payment Award
Share-based compensation arrangement by share-based payment award, equity instruments other than options, nonvested, number			286,000	286,000		286,000			428,000
RCS | Outside of the Plans | Streamlit, Inc.
Share-based Compensation Arrangement by Share-based Payment Award
Share-based compensation arrangement by share-based payment award, equity instruments other than options, nonvested, number			300,000			300,000
Performance-based restricted stock
Share-based Compensation Arrangement by Share-based Payment Award
Granted (shares)				500,000
Performance-based restricted stock | 2020 Plan
Share-based Compensation Arrangement by Share-based Payment Award
Vesting period (years)						4 years
Share-based compensation expense | $			$ 6,300			$ 10,100
Performance-based restricted stock | 2020 Plan | Minimum
Share-based Compensation Arrangement by Share-based Payment Award
Performance target, percentage						0.00%
Performance-based restricted stock | 2020 Plan | Maximum
Share-based Compensation Arrangement by Share-based Payment Award
Performance target, percentage				120.00%		120.00%
Performance-based restricted stock | 2020 Plan | Grant Date
Share-based Compensation Arrangement by Share-based Payment Award
Vesting period (years)						1 year
Class A Common Stock | RCS | Outside of the Plans | Streamlit, Inc.
Share-based Compensation Arrangement by Share-based Payment Award
Granted (shares)		400,000					400,000
Post-combination share-based compensation arrangement by share-based payment award, award vesting period		3 years					3 years
Post-combination share-based compensation arrangement by share-based payment award, equity instruments other than options, granted in period, total fair value | $		$ 93,700					$ 93,700
Post-combination share-based compensation arrangement by share-based payment award, award service period		3 years					3 years