Basis of Presentation and Summary of Significant Accounting Policies - Schedule of Segment Reporting Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2025	Oct. 31, 2024	Oct. 31, 2025	Oct. 31, 2024
Segment Reporting Information [Line Items]
Revenue	$ 1,212,909	$ 942,094	$ 3,399,952	$ 2,639,626
Cost of revenue	390,873	320,894	1,111,474	881,489
Sales and marketing	550,364	437,962	1,510,875	1,239,409
Research and development	494,027	442,435	1,458,434	1,290,889
General and administrative	107,118	106,260	436,175	297,171
Interest income	45,481	48,655	148,111	152,699
Interest expense	(2,075)	(689)	(6,220)	(689)
Other expense, net	(1,854)	(8,474)	(34,897)	(37,722)
Provision for income taxes	3,682	1,937	9,473	8,444
Net income (loss)	(291,603)	(327,902)	(1,019,485)	(963,488)
Product revenue
Segment Reporting Information [Line Items]
Revenue	1,158,377	900,282	3,245,686	2,519,119
Professional services and other revenue
Segment Reporting Information [Line Items]
Revenue	$ 54,532	$ 41,812	$ 154,266	$ 120,507
Third-Party Cloud Infrastructure Expenses | Cost Of Product Revenue Benchmark | Cost Of Product Revenue Type Risk
Segment Reporting Information [Line Items]
Concentration risk, percentage	72.00%	64.00%	70.00%	65.00%
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	38.00%	37.00%	37.00%	37.00%
Reportable Segment
Segment Reporting Information [Line Items]
Revenue	$ 1,212,909	$ 942,094	$ 3,399,952	$ 2,639,626
Sales and marketing	550,364	437,962	1,510,875	1,239,409
Research and development	494,027	442,435	1,458,434	1,290,889
General and administrative	107,118	106,260	436,175	297,171
Interest income	(45,481)	(48,655)	(148,111)	(152,699)
Interest expense	2,075	689	6,220	689
Other expense, net	1,854	8,474	34,897	37,722
Provision for income taxes	3,682	1,937	9,473	8,444
Net income (loss)	(291,603)	(327,902)	(1,019,485)	(963,488)
Reportable Segment | Product revenue
Segment Reporting Information [Line Items]
Cost of revenue	320,810	263,622	908,402	718,861
Reportable Segment | Professional services and other revenue
Segment Reporting Information [Line Items]
Cost of revenue	$ 70,063	$ 57,272	$ 203,072	$ 162,628