Balance Sheet Components - Schedule of Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Apr. 30, 2020	Jan. 31, 2020
Finite-Lived Intangible Assets [Line Items]
Gross Fair Value	$ 707,317	$ 707,317
Accumulated Amortization	(121,757)	(102,081)
Net Book Value	$ 585,560	$ 605,236
Weighted Average Remaining Useful Life (in years)	8 years 6 months	8 years 8 months 12 days
Developed technology
Finite-Lived Intangible Assets [Line Items]
Gross Fair Value	$ 17,570	$ 17,570
Accumulated Amortization	(12,113)	(11,321)
Net Book Value	$ 5,457	$ 6,249
Weighted Average Remaining Useful Life (in years)	1 year 9 months 18 days	2 years
Customer relationships and other acquired intangible assets
Finite-Lived Intangible Assets [Line Items]
Gross Fair Value	$ 671,447	$ 671,447
Accumulated Amortization	(97,444)	(80,847)
Net Book Value	$ 574,003	$ 590,600
Weighted Average Remaining Useful Life (in years)	8 years 8 months 12 days	8 years 10 months 24 days
Unbilled contracts
Finite-Lived Intangible Assets [Line Items]
Gross Fair Value	$ 18,300	$ 18,300
Accumulated Amortization	(12,200)	(9,913)
Net Book Value	$ 6,100	$ 8,387
Weighted Average Remaining Useful Life (in years)	8 months 12 days	10 months 24 days