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Property and Equipment, Net (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2019	Apr. 30, 2018	Jan. 31, 2019
Property, Plant and Equipment [Line Items]
Property and equipment, net	$ 84,094		$ 75,832
Depreciation expense	7,200	$ 6,200
Computer and network equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	55,107		55,233
Software, including capitalized software development costs
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	30,477		27,959
Furniture and office equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	11,587		9,511
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	43,477		41,464
Property and equipment, excluding work in progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	140,648		134,167
Less: Accumulated depreciation	(70,448)		(66,479)
Property and equipment, net	70,200		67,688
Work in progress
Property, Plant and Equipment [Line Items]
Property and equipment, net	$ 13,894		8,144
Israel Leased Property | Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, net			$ 2,500

X

- Definition

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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The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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