Balance Sheet Components - Property plant and equipment (Details) - USD ($) $ in Thousands	Jul. 31, 2025	Jan. 31, 2025
Property, Plant and Equipment [Line Items]
Total property and equipment, gross	$ 144,367	$ 129,147
Less: accumulated depreciation and amortization	(86,032)	(75,953)
Total property and equipment, net	58,335	53,194
Equipment
Property, Plant and Equipment [Line Items]
Total property and equipment, gross	76,911	75,589
Capitalized internal-use software
Property, Plant and Equipment [Line Items]
Total property and equipment, gross	46,693	36,132
Leasehold improvements
Property, Plant and Equipment [Line Items]
Total property and equipment, gross	15,904	12,739
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Total property and equipment, gross	$ 4,859	$ 4,687