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Geographic Information (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2019 USD ($)	Jul. 31, 2018 USD ($)	Jul. 31, 2019 USD ($) segment	Jul. 31, 2018 USD ($)	Jan. 31, 2019 USD ($)
Revenues from External Customers and Long-Lived Assets [Line Items]
Number of operating segments | segment			1
Number of reportable segments | segment			1
Total revenue	$ 235,612	$ 167,044	$ 449,574	$ 322,852
Total property and equipment	92,078		92,078		$ 75,832
U.S.
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	193,736	138,543	370,002	268,357
Total property and equipment	76,349		76,349		60,625
International
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	41,876	$ 28,501	79,572	$ 54,495
Total property and equipment	$ 15,729		$ 15,729		$ 15,207

X

- Definition

Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

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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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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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