Goodwill and Other Intangible Assets - Summary of Other Intangible Assets Balances (Details) - USD ($) $ in Thousands	9 Months Ended
	Oct. 31, 2019	Jan. 31, 2019
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 124,675	$ 67,674
Accumulated Amortization	(27,827)	(11,749)
Net Carrying Amount	$ 96,848	55,925
Developed technology
Finite Lived Intangible Assets [Line Items]
Weighted Average Remaining Useful Lives (in years)	4 years 1 month 6 days
Gross Carrying Amount	$ 93,836	48,435
Accumulated Amortization	(20,934)	(9,198)
Net Carrying Amount	$ 72,902	39,237
Customer relationships
Finite Lived Intangible Assets [Line Items]
Weighted Average Remaining Useful Lives (in years)	4 years 1 month 6 days
Gross Carrying Amount	$ 29,994	18,894
Accumulated Amortization	(6,323)	(2,363)
Net Carrying Amount	$ 23,671	16,531
Trademarks
Finite Lived Intangible Assets [Line Items]
Weighted Average Remaining Useful Lives (in years)	7 months 6 days
Gross Carrying Amount	$ 845	345
Accumulated Amortization	(570)	(188)
Net Carrying Amount	$ 275	$ 157