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Property and Equipment, Net (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2019	Jul. 31, 2018	Jul. 31, 2019	Jul. 31, 2018	Jan. 31, 2019
Property, Plant and Equipment [Line Items]
Property and equipment, net	$ 92,078		$ 92,078		$ 75,832
Depreciation expense	7,900	$ 5,300	15,100	$ 11,500
Computer and network equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	62,751		62,751		55,233
Software, including capitalized software development costs
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	31,435		31,435		27,959
Furniture and office equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	11,982		11,982		9,511
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	48,109		48,109		41,464
Property and equipment, excluding work in progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	154,277		154,277		134,167
Less: Accumulated depreciation	(73,942)		(73,942)		(66,479)
Property and equipment, net	80,335		80,335		67,688
Work in progress
Property, Plant and Equipment [Line Items]
Property and equipment, net	$ 11,743		$ 11,743		8,144
Israel Leased Property | Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, net					$ 2,500

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Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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