Goodwill and Intangible Assets, Net - Schedule Intangible Assets, Net (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Apr. 30, 2020	Apr. 30, 2019	Jan. 31, 2020	Jan. 31, 2019
Intangible Assets, Gross [Roll Forward]
Beginning of period	$ 25,227	$ 1,900	$ 1,900
Identifiable Intangible Assets Acquired	5,174		23,327
End of period	30,401		25,227
Accumulated Amortization [Roll Forward]
Beginning of period	(3,921)	(1,594)	(1,594)
Amortization of Intangible Assets	(1,389)	(100)	(2,327)
End of period	(5,310)		(3,921)
Intangible assets, net	25,091		21,306	$ 306
Developed technology
Intangible Assets, Gross [Roll Forward]
Beginning of period	18,670	1,900	1,900
Identifiable Intangible Assets Acquired	2,826		16,770
End of period	21,496		18,670
Accumulated Amortization [Roll Forward]
Beginning of period	(3,473)	(1,594)	(1,594)
Amortization of Intangible Assets	(981)		(1,879)
End of period	(4,454)		(3,473)
Intangible assets, net	$ 17,042		$ 15,197	306
Intangible assets, estimated useful life	4 years 3 months 18 days		4 years 3 months 18 days
Customer relationships
Intangible Assets, Gross [Roll Forward]
Beginning of period	$ 5,237	0	$ 0
Identifiable Intangible Assets Acquired	1,983		5,237
End of period	7,220		5,237
Accumulated Amortization [Roll Forward]
Beginning of period	(351)	0	0
Amortization of Intangible Assets	(329)		(351)
End of period	(680)		(351)
Intangible assets, net	$ 6,540		$ 4,886	0
Intangible assets, estimated useful life	4 years 6 months		4 years 6 months
Trademarks
Intangible Assets, Gross [Roll Forward]
Beginning of period	$ 1,320	0	$ 0
Identifiable Intangible Assets Acquired	365		1,320
End of period	1,685		1,320
Accumulated Amortization [Roll Forward]
Beginning of period	(97)	$ 0	0
Amortization of Intangible Assets	(79)		(97)
End of period	(176)		(97)
Intangible assets, net	$ 1,509		$ 1,223	$ 0
Intangible assets, estimated useful life	4 years 6 months		4 years 6 months