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Goodwill and Intangible Assets, net Schedule of Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2020	Jan. 31, 2019		Jan. 31, 2018	[1]
Finite-Lived Intangible Assets [Line Items]
Gross	$ 54,802	$ 25,461
Accumulated Amortization	(22,154)	(11,564)
Write-offs	(119)	0	[1]	$ (1,114)
Net	32,529	13,897
Capitalized internal-use software costs
Finite-Lived Intangible Assets [Line Items]
Gross	24,890	19,838
Accumulated Amortization	(14,828)	(9,969)
Write-offs	(119)	0
Net	9,943	9,869
Purchased developed technology
Finite-Lived Intangible Assets [Line Items]
Gross	28,800	4,600
Accumulated Amortization	(6,321)	(833)
Write-offs	0	0
Net	22,479	3,767
Software licenses
Finite-Lived Intangible Assets [Line Items]
Gross	1,112	1,023
Accumulated Amortization	(1,005)	(762)
Write-offs	0	0
Net	$ 107	$ 261
[1] Adjusted for adoption of ASC 842. See Note 2.

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Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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