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Acquisition-related Intangible Assets, Net (Schedule of Acquired Assets) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2019	Jan. 31, 2018	Jan. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Intangible assets, gross	$ 398,800	$ 70,700
Less accumulated amortization	(85,560)	(36,466)
Total	313,240	34,234
Developed technology
Finite-Lived Intangible Assets [Line Items]
Intangible assets, gross	186,800	69,700
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Intangible assets, gross	189,000	1,000
Trade name
Finite-Lived Intangible Assets [Line Items]
Intangible assets, gross	12,000	0
Backlog
Finite-Lived Intangible Assets [Line Items]
Intangible assets, gross	11,000	0
Acquired developed technology and customer relationship assets
Finite-Lived Intangible Assets [Line Items]
Total	313,240
Amortization of intangible assets	$ 49,000	$ 19,000	$ 13,000

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