Balance Sheet Components - Schedule of Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2020	Jan. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Gross Fair Value	$ 707,317	$ 701,383
Accumulated Amortization	(102,081)	(22,057)
Net Book Value	$ 605,236	$ 679,326
Weighted Average Remaining Useful Life (in years)	8 years 8 months 12 days	9 years 7 months 6 days
Developed technology
Finite-Lived Intangible Assets [Line Items]
Gross Fair Value	$ 17,570	$ 11,986
Accumulated Amortization	(11,321)	(9,258)
Net Book Value	$ 6,249	$ 2,728
Weighted Average Remaining Useful Life (in years)	2 years	1 year 10 months 24 days
Customer relationships and other acquired intangible assets
Finite-Lived Intangible Assets [Line Items]
Gross Fair Value	$ 671,447	$ 671,097
Accumulated Amortization	(80,847)	(12,036)
Net Book Value	$ 590,600	$ 659,061
Weighted Average Remaining Useful Life (in years)	8 years 10 months 24 days	9 years 10 months 24 days
Unbilled contracts
Finite-Lived Intangible Assets [Line Items]
Gross Fair Value	$ 18,300	$ 18,300
Accumulated Amortization	(9,913)	(763)
Net Book Value	$ 8,387	$ 17,537
Weighted Average Remaining Useful Life (in years)	10 months 24 days	1 year 10 months 24 days