Basis of Presentation and Summary of Significant Accounting Policies - Schedule of Segment Reporting Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2025	Apr. 30, 2024
Segment Reporting Information [Line Items]
Revenue	$ 1,042,074	$ 828,709
Cost of revenue	348,786	272,517
Sales and marketing	458,554	400,822
Research and development	472,404	410,794
General and administrative	209,587	93,148
Interest income	53,163	54,779
Interest expense	(2,071)	0
Other expense, net	(28,058)	(21,302)
Provision for income taxes	5,729	2,721
Net loss	(429,952)	(317,816)
Product revenue
Segment Reporting Information [Line Items]
Revenue	996,813	789,587
Professional services and other revenue
Segment Reporting Information [Line Items]
Revenue	$ 45,261	$ 39,122
Third-Party Cloud Infrastructure Expenses | Cost Of Product Revenue Benchmark | Cost Of Product Revenue Type Risk
Segment Reporting Information [Line Items]
Concentration risk, percentage	68.00%	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	34.00%	37.00%
Reportable Segment
Segment Reporting Information [Line Items]
Revenue	$ 1,042,074	$ 828,709
Sales and marketing	458,554	400,822
Research and development	472,404	410,794
General and administrative	209,587	93,148
Interest income	(53,163)	(54,779)
Interest expense	2,071	0
Other expense, net	28,058	21,302
Provision for income taxes	5,729	2,721
Net loss	(429,952)	(317,816)
Reportable Segment | Product revenue
Segment Reporting Information [Line Items]
Cost of revenue	285,276	219,657
Reportable Segment | Professional services and other revenue
Segment Reporting Information [Line Items]
Cost of revenue	$ 63,510	$ 52,860