Basis of Presentation and Summary of Significant Accounting Policies - Schedule of Segment Reporting Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2025	Jul. 31, 2024	Jul. 31, 2025	Jul. 31, 2024
Segment Reporting Information [Line Items]
Revenue	$ 1,144,969	$ 868,823	$ 2,187,043	$ 1,697,532
Cost of revenue	371,815	288,078	720,601	560,595
Sales and marketing	501,957	400,625	960,511	801,447
Research and development	492,003	437,660	964,407	848,454
General and administrative	119,470	97,763	329,057	190,911
Interest income	49,467	49,265	102,630	104,044
Interest expense	(2,074)	0	(4,145)	0
Other expense, net	(4,985)	(7,946)	(33,043)	(29,248)
Provision for income taxes	62	3,786	5,791	6,507
Net income (loss)	(297,930)	(317,770)	(727,882)	(635,586)
Product revenue
Segment Reporting Information [Line Items]
Revenue	1,090,496	829,250	2,087,309	1,618,837
Professional services and other revenue
Segment Reporting Information [Line Items]
Revenue	$ 54,473	$ 39,573	$ 99,734	$ 78,695
Third-Party Cloud Infrastructure Expenses | Cost Of Product Revenue Benchmark | Cost Of Product Revenue Type Risk
Segment Reporting Information [Line Items]
Concentration risk, percentage	70.00%	65.00%	69.00%	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%	38.00%	36.00%	38.00%
Reportable Segment
Segment Reporting Information [Line Items]
Revenue	$ 1,144,969	$ 868,823	$ 2,187,043	$ 1,697,532
Sales and marketing	501,957	400,625	960,511	801,447
Research and development	492,003	437,660	964,407	848,454
General and administrative	119,470	97,763	329,057	190,911
Interest income	(49,467)	(49,265)	(102,630)	(104,044)
Interest expense	2,074	0	4,145	0
Other expense, net	4,985	7,946	33,043	29,248
Provision for income taxes	62	3,786	5,791	6,507
Net income (loss)	(297,930)	(317,770)	(727,882)	(635,586)
Reportable Segment | Product revenue
Segment Reporting Information [Line Items]
Cost of revenue	302,316	235,582	587,592	455,239
Reportable Segment | Professional services and other revenue
Segment Reporting Information [Line Items]
Cost of revenue	$ 69,499	$ 52,496	$ 133,009	$ 105,356