Basis of Presentation and Summary of Significant Accounting Policies - Schedule of Segment Reporting Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2025	Jan. 31, 2024	Jan. 31, 2023
Segment Reporting Information [Line Items]
Revenue	$ 3,626,396	$ 2,806,489	$ 2,065,659
Cost of revenue	1,214,673	898,558	717,540
Sales and marketing	1,672,092	1,391,747	1,106,507
Research and development	1,783,379	1,287,949	788,058
General and administrative	412,262	323,008	295,821
Interest income	209,009	200,663	73,839
Interest expense	(2,759)	0	0
Other income (expense), net	(35,339)	44,887	(47,565)
Provision for (benefit from) income taxes	4,113	(11,233)	(18,467)
Net loss	(1,289,212)	(837,990)	(797,526)
Product revenue
Segment Reporting Information [Line Items]
Revenue	3,462,422	2,666,849	1,938,783
Professional services and other revenue
Segment Reporting Information [Line Items]
Revenue	$ 163,974	$ 139,640	$ 126,876
Third-Party Cloud Infrastructure Expenses | Cost Of Product Revenue Benchmark | Cost Of Product Revenue Type Risk
Segment Reporting Information [Line Items]
Concentration risk, percentage	65.00%	67.00%	71.00%
Personnel-Related Expenses | 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%	38.00%	38.00%
Reportable Segment
Segment Reporting Information [Line Items]
Revenue	$ 3,626,396	$ 2,806,489	$ 2,065,659
Sales and marketing	1,672,092	1,391,747	1,106,507
Research and development	1,783,379	1,287,949	788,058
General and administrative	412,262	323,008	295,821
Interest income	(209,009)	(200,663)	(73,839)
Interest expense	2,759	0	0
Other income (expense), net	35,339	(44,887)	47,565
Provision for (benefit from) income taxes	4,113	(11,233)	(18,467)
Net loss	(1,289,212)	(837,990)	(797,526)
Reportable Segment | Product revenue
Segment Reporting Information [Line Items]
Cost of revenue	992,069	701,200	547,547
Reportable Segment | Professional services and other revenue
Segment Reporting Information [Line Items]
Cost of revenue	$ 222,604	$ 197,358	$ 169,993