Basis of Presentation and Summary of Significant Accounting Policies - Schedule of Segment Reporting Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2026	Jan. 31, 2025	Jan. 31, 2024
Segment Reporting Information [Line Items]
Revenue	$ 4,683,946	$ 3,626,396	$ 2,806,489
Cost of revenue	1,537,805	1,214,673	898,558
Sales and marketing	2,062,137	1,672,092	1,391,747
Research and development	1,969,472	1,783,379	1,287,949
General and administrative	549,697	412,262	323,008
Interest income	190,556	209,009	200,663
Interest expense	8,298	2,759	0
Other income (expense), net	(59,003)	(35,339)	44,887
Provision for (benefit from) income taxes	17,125	4,113	(11,233)
Net income (loss)	(1,329,035)	(1,289,212)	(837,990)
Product revenue
Segment Reporting Information [Line Items]
Revenue	4,472,317	3,462,422	2,666,849
Professional services and other revenue
Segment Reporting Information [Line Items]
Revenue	$ 211,629	$ 163,974	$ 139,640
Third-Party Cloud Infrastructure Expenses | Cost Of Product Revenue Benchmark | Cost Of Product Revenue Type Risk
Segment Reporting Information [Line Items]
Concentration risk, percentage	71.00%	65.00%	67.00%
Personnel-Related Expenses, Excluding Stock-Based Compensation And Associated Payroll Taxes | Cost Of Revenue And Operating Expenses Benchmark | Cost Of Revenue And Operating Expenses Type Risk
Segment Reporting Information [Line Items]
Concentration risk, percentage	37.00%	37.00%	38.00%
Reportable Segment
Segment Reporting Information [Line Items]
Revenue	$ 4,683,946	$ 3,626,396	$ 2,806,489
Sales and marketing	2,062,137	1,672,092	1,391,747
Research and development	1,969,472	1,783,379	1,287,949
General and administrative	549,697	412,262	323,008
Interest income	(190,556)	(209,009)	(200,663)
Interest expense	8,298	2,759	0
Other income (expense), net	59,003	35,339	(44,887)
Provision for (benefit from) income taxes	17,125	4,113	(11,233)
Net income (loss)	(1,329,035)	(1,289,212)	(837,990)
Reportable Segment | Product revenue
Segment Reporting Information [Line Items]
Cost of revenue	1,260,324	992,069	701,200
Reportable Segment | Professional services and other revenue
Segment Reporting Information [Line Items]
Cost of revenue	$ 277,481	$ 222,604	$ 197,358