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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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Property and Equipment (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
Property and Equipment (Details) - USD ($) $ in Thousands	Jul. 31, 2020	Jul. 31, 2019	Jul. 31, 2020	Jul. 31, 2019	Jan. 31, 2020
Property, Plant and Equipment
Property and equipment, gross	$ 316,572		$ 316,572		$ 280,425
Less: accumulated depreciation and amortization	(132,743)		(132,743)		(123,497)
Property and equipment, net	183,829		183,829		156,928
Depreciation and amortization expense on Property and Equipment, net	7,700	$ 6,600	13,500	$ 12,900
Computer equipment and software
Property, Plant and Equipment
Property and equipment, gross	107,845		107,845		109,892
Furniture and fixtures
Property, Plant and Equipment
Property and equipment, gross	32,112		32,112		28,568
Leasehold and building improvements
Property, Plant and Equipment
Property and equipment, gross	176,615		176,615		141,965
Leasehold improvements not in service
Property, Plant and Equipment
Property and equipment, gross	$ 29,000		$ 29,000		$ 46,500